Homework Help: Math: Statistics

Recent Homework Questions About Statistics

statistics
On average, 30-minute television sitcoms have 22 minutes of programming.If a probability distribution for minutes of programming can be approximated by a uniform distribution from 18 minutes to 26 minutes. What is the probability a sitcom will have 25 or more minutes of ...
Friday, November 11, 2011 at 11:20pm

Statistics
For all of the following use the five step process to solve the problem in the question, that is, state the null hypothesis, the alternative hypothesis, the level of significance and the type of test (z-test, t-test, p-value, confidence limit and whether it is two tailed, one-...
Friday, November 11, 2011 at 11:11pm

statistics
Suppose a population distribution of SAT scores has population mean 500 and population standard deviation 100. What is the mean of the sampling distribution of sample means, ybar , calculated from samples of size n = 36
Friday, November 11, 2011 at 8:12pm

statistics
Suppose that the height of male students at a large university is normally distributed with a mean of 69 inches and a standard deviation of 3.0 inches. If 16 samples consisting of 25 students each are obtained, what is the probability that the mean of these 16 samples is ...
Friday, November 11, 2011 at 7:20pm

statistics
give an example where the median would be less than the mean.
Friday, November 11, 2011 at 6:11pm

statistics
given 100,90,80,75,70,60,30,25,5,4 what score corresponds to the 70th percentile?
Friday, November 11, 2011 at 6:10pm

statistics
Suppose that there are 10 million workers in Canada and South Korea and each worker in Canada and South Korea can produce 4 cars per year. A Canadian worker can produce 10 tonnes of grain a year, whereas a South Korean worker can produce 5 tonnes of grain a year. The following...
Friday, November 11, 2011 at 4:24pm

statistics
2. Punkey Electronics, a small manufacturer of electronic research equipment, has approximately 7,000 items in its inventory. They just hired Joe Detail to manage the inventory. Joe has determined that 10% of the items in inventory are A items, 35% are B items and 55% are C ...
Friday, November 11, 2011 at 3:31pm

statistics
A nationwide study indicated that 27% of adults said that chocolate was their favorite ice cream flavor. A simple random sample of 150 adults is obtained. A.) Describe the sampling distribtuion of p, the sample proportion of adults whose favorite ice cream flavor is chocolate...
Friday, November 11, 2011 at 2:30pm

statistics
A shipping company received an order of 1645 packages. The manager needs to determin the mean weight of the packages. (A) How many randomly selected packages would be need to weight to estimate with a 95% confidence, the mean weight within +/-1.5 pounds if prior studies ...
Friday, November 11, 2011 at 2:32am

statistics
a student took a 25 question true and false test answering the question randomly without reading them. If a score of 18 is correct is the minimum passing grade, how likely (calculate probability) is it that the random guesser will pass the test
Thursday, November 10, 2011 at 9:48pm

statistics
A group of adults of 200 aged 21 to 50 were selected from those entering Fit Right Health stores in Washington state, and were randomly divided into two groups. One group was given an herb and the othe placebo. After 6 months, the the number of respiratory tract infections in ...
Thursday, November 10, 2011 at 9:33pm

Statistics
Suppose the heights of women aged 20 to 29 follow approximately the N(66.7, 2.4) distribution. Also suppose men the same age have heights distributed as N(70.5, 2.2). What percent (± 0.1) of young men are shorter than average young women?
Thursday, November 10, 2011 at 1:46pm

statistics
an industrial designer wants to determinethe average amount of time it takes an adult to assemble an easy-to- assembletoy .use the following data (inminites)a random sample, to construct a 95% confidence interval for the mean of the population sampled:17 13 18 19 17 21 29 22 ...
Thursday, November 10, 2011 at 12:16pm

College Statistics
A random sample of greeting cards is a mean value of $2.55 and a standard deviation of $0.44 So construct a 95% confidence interval estimate of the mean value of all cards in the store's inventory. So if the 2500 cards in the inventory then how are the results in assisting...
Wednesday, November 9, 2011 at 10:11pm

statistics
Can any sample proportion less than 0.5 be used to support a claim that the population proportion is greater than 0.5?
Wednesday, November 9, 2011 at 5:54pm

statistics
if 1 adult male is randomly selected and is assumed to have 20 lb of carry on baggage, find the probabilty that his total is greater than 195 lb
Wednesday, November 9, 2011 at 5:48pm

statistics
Help!!!!!! A confidence interval estimate for the population mean is given to be (39,90, 48.11) If the standard deviation is 11.473 and the sample size is 52 determine the maximum error of the estimate. determine the confidence level used for the given confidence interval
Wednesday, November 9, 2011 at 5:02pm

statistics
space shuttle astronauts each consume an average of 3000 calories per day. one meal normally consists of a main dish, a vegetable dish, and 2 different desserts. the astronauts can choose from 11 man dishes, 8 vegetable dishes, and 12 desserts. how many different meals are ...
Wednesday, November 9, 2011 at 4:23pm

statistics
about 11% of the population is nervous around strangers. if 2 people are randomly selected, what is the probability that both are nervous and strangers? what is the probability that at least one is nervous around strangers?
Wednesday, November 9, 2011 at 4:15pm

statistics
suppose you just received a shipment of 13 tvs. 3 of them are defective. if 2 tvs are randomly selected compute the probability that both tvs work and what is the probability at least one doesn't work? answer as a fraction in simplified form
Wednesday, November 9, 2011 at 4:12pm

statistics-math
The mean score on a Math exam was 50% and the standard deviation was 10%. Assume the results were normally distributed. (a) What percent of students earned a score between 50% and 70%? ( /2)
Wednesday, November 9, 2011 at 3:25pm

Statistics
Evolutionary theories often emphasize that humans have adapted to their physical environment. One such theory hypothesizes that people should spontaneously follow a 24-hour cycle of sleeping and waking—even if they are not exposed to the usual pattern of sunlight. To test...
Wednesday, November 9, 2011 at 3:14pm

Statistics
A box contains 12 lights bulbs, of which 4 are defective. All bulbs look alike and have equal chance of being chosen. 3 light bulbs are selected from the box to check the quality. a. List all the possible outcomes b. find the probability that all 3 are defective c. Find the ...
Wednesday, November 9, 2011 at 1:23pm

statistics
A psychologist wants to estimate the variance of employee test scores. A random sample of 18 scores had a sample standard deviation 10.4. Find a 90% confidence 2 interval for the population variance. What assumption, if any, have you made in calculating this interval estimate?
Wednesday, November 9, 2011 at 9:21am

Statistics
Ticket sales for opening night of a movie have a mean of $2100 with a standard deviation of $450. Assume these ticket sales follow a normal distribution. If a movie is selected randomly, what is the probability that opening night ticket sales are more than $1620?
Wednesday, November 9, 2011 at 6:57am

6th grade ELA
supporting ideas such as statistics and _______________ help explain the main idea.
Tuesday, November 8, 2011 at 8:08pm

Statistics
What z- value would you use if you wanted to construct a 73% confidence interval estimate for mean?
Tuesday, November 8, 2011 at 6:41pm

statistics
time required to complete a statistics exam is uniformly distributed between 60 and 150 minutes. What is the probability that a student will take longer than 120 minutes to complete the exam
Tuesday, November 8, 2011 at 6:33pm

statistics
we have a normal distribution with mean 76 and standard deviation 6.4, find the percent between 69.6 & 76?
Tuesday, November 8, 2011 at 6:30pm

statistics
Suppose you agree to meet a friend(who is generally late) at a specified time. Assume that you arrive on time and let the random variable T be the length off time you must wait for your friend. If the density function for T is assume to be f(t)=1/t^2, t>=1(minute) Find the ...
Tuesday, November 8, 2011 at 5:08pm

statistics
The breakdown of workers in a particular state according to their political affiliation and type of job held is shown here. Suppose a worker is selected at random within the state and the worker's political affiliation and type of job are noted. Given the worker is a ...
Tuesday, November 8, 2011 at 4:39pm

statistics
If one card is drawn from a standard 52 card playing deck, determine the probability of getting a jack, a three, a club or a diamond. Round to the nearest hundredth
Tuesday, November 8, 2011 at 4:02pm

statistics
A sample of 275 shoppers at a large suburban mall were asked two questions: (1) Did you see a television ad for the sale at department store X during the past 2 weeks? (2) Did you shop at department store X during the past 2 weeks? The responses to the questions are summarized...
Tuesday, November 8, 2011 at 3:59pm

statistics
The below table shows the probabilities generated by rolling one die 50 times and noting the up face. What is the probability of getting an odd up face?
Tuesday, November 8, 2011 at 3:42pm

Statistics
In a population of 240 women,the heights of the women are normally distributed with a mean of 64.2 inches and a standard deviation of 3.2 inches. If 36 women are selected at random, find the mean mu x and stand deviation sigma x of the population of sample means. Assume that ...
Tuesday, November 8, 2011 at 12:49pm

Statistics
2. Obtain and interpret descriptive statistics (Mean, Median, Variance, and Std. Dev.). Include the STATA outputs in your results. (Use Stat command “tabstat crimerat police59, statistics(mean, p50, var, sd)” (3 pts) . tabstat crimerat police59,statistics (mean, p50...
Tuesday, November 8, 2011 at 11:54am

statistics
A manufacturer wishes to estimate the reliability (in months) of a certain product. An estimate of the population standard deviation from a previous sample was 12 months. If the manufacturer desires to be within 4 months of the true value with approximately 80% confidence, ...
Tuesday, November 8, 2011 at 11:28am

statistics
The owner of a computer repair shop has determined that their daily revenue has mean $7200 and standard deviation $1200. The daily revenue totals for the next 30 days will be monitored. What is the probability that the mean daily revenue for the next 30 days will exceed $7000?
Tuesday, November 8, 2011 at 1:25am

statistics
The amount of corn chips dispensed into a 16-ounce bag by the dispensing machine has been identified at possessing a normal distribution with a mean of 16.5 ounces and a standard deviation of 0.1 ounce. Suppose 400 bags of chips were randomly selected from this dispensing ...
Tuesday, November 8, 2011 at 1:20am

statistics
The average score of all golfers for a particular course has a mean of 73 and a standard deviation of 3. Suppose 36 golfers played the course today. Find the probability that the average score of the 36 golfers exceeded 74.
Tuesday, November 8, 2011 at 1:16am

statistics
Assume that blood pressure readings are normally distributed with a mean of 123 and a standard deviation of 9.6. If 144 people are randomly selected, find the probability that their mean blood pressure will be less than 125
Tuesday, November 8, 2011 at 1:09am

Statistics
(a) If 10 auto insurance claims are taken at random, use the binomial distribution to determine the probability that: (i) at least 6 claims are fraudulent (ii) at most 3 claims are fraudulent (iii) anywhere between 5 and 8 (inclusive) claims are fraudulent (iv) at least 1 ...
Tuesday, November 8, 2011 at 12:06am

statistics
select a scale for the data on average highs if the lowest tempreture is 72 and the highest is 88: (A)70 to 90 (B) 69 to 90) (C) 60 to 100 (D) 60 to 80 ?
Monday, November 7, 2011 at 9:41pm

statistics
47 65 42 47 16 36 54 17 21 58 16 31 32 13 22 The following list contains P/E ratios (price of stock divided by projected earnings per share) for health care companies. Find th and th percentiles for these ratios.
Monday, November 7, 2011 at 5:33pm

statistics
A group of six students all have different grades in statistics. The median mark in the group is 68. If two of the six students are selected at random, what is the probability that both have marks greater than 68?
Monday, November 7, 2011 at 4:23pm

statistics
a public health investigator wishes to determine whether a new anti-smoking film actually reduces the daily consumption of cigarette by heavy smokers. The mean daily cigarette consumption is calculated consumption for each of eight heavy smokers during the month before the ...
Monday, November 7, 2011 at 3:42pm

statistics
A survey was conducted to measure the number of hours per week adults spend on home computers. In the survey, the number of hours was normally distributed, with a mean of 8 hours and a standard deviation of 1 hour. A survey participant is randomly selected. Find the ...
Monday, November 7, 2011 at 1:50pm

Statistics
with a mean/median/mode value of 22 and a standard deviation of 17. Based on these numbers, we can say that approximately 50 percent of SOC 390 students work more than ____ hours per week? ..I don't understand how to figure this question out?
Monday, November 7, 2011 at 1:09pm

statistics
Anne, Joe and Lynn, in this order, will take turns to draw two cards from a standard deck of 52 cards. Note that each draw of 2 cards is w/o replacement but draws of different turns are with replacement (the preceding two cards will be put back and the deck will be reshuffled...
Monday, November 7, 2011 at 9:38am

statistics
high temperatures in a certain city for the of the month of august follow a uniform distribution over the interval 73 degreef to 103 degree f find the high temperature which 90% of the august days exceeded
Monday, November 7, 2011 at 12:08am

statistics
suppose x is a uniform random variable with c=40 ana d= 70 find the probability that a randomly selected observation is between 43 and 65
Monday, November 7, 2011 at 12:02am

statistics
provided with data representing the time it took husbands and wives to run a mile. All data are in minutes Husband Wife 8.2 9.7 8.9 8.5 9.7 8.9 9.8 8 10 9 7.9 7.9 6.7 8 8.9 7.9 12.2 9.9 15 10.2 8.8 8.4 8.9 -- 21 10.4 11.3 9.2
Sunday, November 6, 2011 at 10:54pm

statistics
suppose x is a uniform random variable with c == 40 and d ==70 . what is the probability that a randomly selected observation is between 43 and 65
Sunday, November 6, 2011 at 10:29pm

statistics
The scores on an economics examination are normally distributed with a mean of 66 and a standard deviation of 14. If the instructor wishes to assign a grade of A to the top 10% of the class, what is the lowest score a student may have and still obtain an A?
Sunday, November 6, 2011 at 10:10pm

statistics
Suppose a brewery has a filling machine that fills 12 ounce bottles of beer. It is known that the amount of beer poured by this filling machine follows a normal distribution with a mean of 12.44 ounces and a standard deviation of 0.06 ounce. Find the probability that a sample ...
Sunday, November 6, 2011 at 9:59pm

statistics
population with a mean of 53.1 and standard deviation of 4.43 Calculate z score for xbar 49.8 from a sample of size 11 Someone please please help me!
Sunday, November 6, 2011 at 8:10pm

statistics
Help me! Population of heights of college students is approximately normally distributed with a mean of 64.37 inches and standard deviation of 6.26 inches A random sample of 74 heights is obtained. Find the mean and standard error of the x bar distribution 2. Find P(xbar > ...
Sunday, November 6, 2011 at 7:28pm

statistics
when finding the area to the left of the Z score and Z= 1.43 do i subtract the z score from one or is that only when finding the area to the right of Z
Sunday, November 6, 2011 at 6:52pm

statistics
Health care workers are at risk of being exposed to blood-borne pathogens through needle-stick and other sharp object injuries. The pathogens of primary concern are the human immunodeficiency virus, hepatitis B virus, and hepatitis C virus. When a needle-stick injury occurs, ...
Sunday, November 6, 2011 at 2:51pm

statistics
If the standard deviation for waiting times in a line is 5 minutes, the standard deviation for the averages of 30 randomly chosen waiting times is _____ minutes.
Sunday, November 6, 2011 at 1:33pm

statistics
A forest fire is burning down a narrow valley 3 miles wide at a speed of 40 feet per minute. The fire can be contained by cutting a firebreak through the forest across the valley. It takes 30 seconds for one person to clear one foot of the firebreak. The value of lost timber ...
Sunday, November 6, 2011 at 1:13pm

statistics
A random sample of n = 9 scores is obtained from a population with ì = 50 and ó = 9. If the sample mean is M = 59, what is the z-score corresponding to the sample mean?
Sunday, November 6, 2011 at 1:02pm

statistics
90% confidence interval for ì turns out to be (150, 250). Based on the interval, do you believe the average is equal to 260? A) Yes, and I am 90% sure of it. B) Yes, and I am 100% sure of it. C) No, and I am 100% sure of it. D) No, and I am 90% sure of it.
Saturday, November 5, 2011 at 10:35pm

statistics
3. The mean volume of draught beer served in pint glasses in a particular pub is known to be 0.564 litres. A consumer organization takes a random sample of 64 pints of draught beer and finds that the standard deviation of this sample is 0.025 litres. What is the probability ...
Saturday, November 5, 2011 at 7:30pm

statistics
4. A large company insists that all job applicants who are invited for an interview take a psychometric test. The results of these tests follow a normal distribution with a mean of 61% and a standard deviation of 7.2%. a) What proportion of applicants would be expected to ...
Saturday, November 5, 2011 at 7:27pm

statistics
2. A pub offers a '10 oz Steak Special'. If the steaks they use for these meals have uncooked weights that are normally distributed with a mean of 9.8 ounces and a standard deviation of 0.5 ounces, what is the probability that a customer will get: I) A steak that has ...
Saturday, November 5, 2011 at 7:25pm

statistics
According to a bank, the time taken by its customers to use cash dispensing machines is normally distributed with a mean of 18 seconds and a standard deviation of 3 seconds. I) What is the probability that a customer selected at random takes less than 13 seconds? II) Find the ...
Saturday, November 5, 2011 at 7:23pm

statistics
Identify why this assigbment if probabilities cannot be legitimite: P(A)=0.4, P(B)=0.3, P(AandB)= 0.5
Saturday, November 5, 2011 at 3:35am

statistics
If a population has a standard deviation of 5 units what is the standard error of the mean if samples of size 25 units are selected????
Friday, November 4, 2011 at 8:29pm

Statistics
Let's pretend the Work variable is normally distributed, with a mean/median/mode value of 22 and a standard deviation of 17. Based on these numbers, we can say that approximately 68 percent of students work between ______ and ______ hours per week. Select the TWO numbers ...
Friday, November 4, 2011 at 4:58pm

statistics
Let's pretend the Work variable is normally distributed, with a mean/median/mode value of 22 and a standard deviation of 17. Based on these numbers, we can say that approximately 50 percent of SOC 390 students work more than ____ hours per week
Friday, November 4, 2011 at 4:57pm

statistics
A single sample is being used to construct a 90% confidence interval for the population mean. What would be the difference between an interval for a sample of n = 25 and the interval for a sample of n = 100? Assume that all other factors are held constant. Options: With n = 25...
Friday, November 4, 2011 at 2:43pm

statistics
A sample of n = 9 has a mean of M = 72 with SS = 162. Use the sample to make a point estimate of ì and to construct the 90% confidence interval for U. (Round all answers to two decimal places.) U = ? ± ? ( ?) The 90% confidence interval for U: ( ? , ? )
Friday, November 4, 2011 at 2:42pm

statistics
A sample of n = 9 has a mean of M = 72 with SS = 162. Use the sample to make a point estimate of ì and to construct the 90% confidence interval for ì. (Round all answers to two decimal places ì = ? ± ? ( ? ) The 90% confidence interval for ì...
Friday, November 4, 2011 at 2:39pm

statistics
If a population has a standard deviation of 5 units what is the standard error of the mean if samples of size 25 units are selected????
Friday, November 4, 2011 at 2:33pm

statistics
A rocket fuel is to contain percent X of a particular chemical. The specification limits for X are 30 to 35%. The manufacturer will make a profit Q(x) on fuel per gallon as follows. Q(x)= 10 cents if 30<=x<=35 5 cents if 35<x<40 or 25<x<30 -10 cents otherwise...
Friday, November 4, 2011 at 10:30am

statistics
For a single sample t-test we don't need to know.................of the population, instead we will have access to the ............of the sample.
Thursday, November 3, 2011 at 4:07pm

statistics
A density graph for all the possible speeds between 0 mph and 320 mph is in the shape of a triangle. What is the height of the triangle?
Thursday, November 3, 2011 at 1:30pm

statistics
A population of scores is normally distributed with a μ = 40, and a σ = 13. What is the probability of randomly selecting a score greater than 54
Wednesday, November 2, 2011 at 11:18pm

Statistics
In each of the following situations, state whether or not the given assignment of probabilities to individual outcomes is legitimate, that is, satisfies the rules of probability. If not, give specific reasons for your answer. a.) when a coin is spun, P(H)=0.55 and P(T)=0.45. b...
Wednesday, November 2, 2011 at 9:24pm

statistics
I have an airplane that has an ignition system that works like this. There are 2 energy producing devices, called magnetos that "fire" the spark plugs, 2 per cylinder. There is a 1 in a 1000 chance that one will fail. What is the chance that Magneto A OR Magneto B ...
Wednesday, November 2, 2011 at 9:17pm

Statistics
The basketball player Steve Nash is the all-time career free throw shooter among active players. He makes about 90% of his free throws. In today's game, Nash misses his first two free throws. The TV commentator says, "Nash's technique looks out of rhythm today.&...
Wednesday, November 2, 2011 at 9:16pm

Statistics
Upon examining its records, a hospital computes the distribution of the number of days a patient stays at the hospital. They find that 50% of patients stayed just one day before leaving. 30% stayed two days, and 10% stayed 3 days. a.) A patient is selected at random from the ...
Wednesday, November 2, 2011 at 9:11pm

Statistics
In a city with no cars of mixed color, 30% of the cars on the road are brown. Forty percent are either brown or green, and 10% are white. a.) What is the probability that a randomly selected car is green? b.) What is the probability that a randomly selected car is not brown, ...
Wednesday, November 2, 2011 at 9:05pm

statistics
A machine produces 49 titanium bolts every 2 hours. At this rate how many bolts does the machine produce in 36 minutes?
Wednesday, November 2, 2011 at 7:21pm

statistics
The external validity of the results from a research study refers to the?
Wednesday, November 2, 2011 at 10:38am

statistics
a firm has 10 sales reps. In how many ways can they be assigned to two territories, with 7 reps in one territory and 3 in the other?
Wednesday, November 2, 2011 at 9:50am

statistics
The average teenager spends 7.5 hours per week playing computer and video games. In a random sample of 110 teenagers, what is the probability that their mean time for playing games is more than 8 hours per week?
Wednesday, November 2, 2011 at 8:36am

probability and statistics
Out of a group of 100 US residents, how many would you expect to have travelled no more than 386.9 miles in any given year?
Wednesday, November 2, 2011 at 2:06am

statistics
Out of a group of 100 US residents, how many would you expect to have travelled no more than 386.9 miles in any given year?
Wednesday, November 2, 2011 at 2:04am

statistics
6. You read in a book about bridge that the probability that each of the four players is dealt exactly one ace is about 0.11. This means that A. in every 100 bridge deals, each player has one ace exactly 11 times. B. in one million bridge deals, the number of deals on which ...
Tuesday, November 1, 2011 at 9:41pm

statistics
what does a 78 percent mean in a home work
Tuesday, November 1, 2011 at 7:26pm

statistics
A national park is famous for its beautiful desert landscape and its many natural rock formations. The following table is based on information gathered by a park ranger of all rock formations of at least 3 feet. The height of the rock formation is rounded to the nearest foot. ...
Tuesday, November 1, 2011 at 6:52pm

statistics
The time necessary to assemble a discount store display is normally distributed with μ = 5 minutes and σ = 30 seconds. A large number of potential employees are timed assembling a practice display. How much time (in minutes) should the personnel manager allow the ...
Tuesday, November 1, 2011 at 3:37pm

statistics
Determine the 90% confidence interval for a sample, taken from a normally distributed population, that has a mean of 685, a sample standard deviation of 74, and a sample size of 29
Tuesday, November 1, 2011 at 3:32pm

statistics
Calculate the first, second, and third quartiles: 20,26,28,25,31,14,23,15,12,26,29,24,31,19,31,17,15,17,20,31,32,16,21,22,28
Monday, October 31, 2011 at 9:24pm

Statistics
The distribution of heights of adult males has a mean of 69 inches and a standard deviation of 4 inches. A random sample of 36 adult males is selected. Find the probability that the average height will be more than 70 inches. a.0.668 b.0.858 c.0.908 d.0.995
Monday, October 31, 2011 at 5:34pm

statistics
Suppose a random sample of 25 students is selected from a community college where the scores in the final exam (out of 125 points) are normally distributed, with mean equal to 112 and standard deviation equal to 12. Find the probability that the sample mean deviates from the ...
Monday, October 31, 2011 at 5:33pm

statistics
The average age of a child in kindergarden is 5 years or 60 months. The standard deviation is 12 months. If a random child is selected, find the probability that the childs age is between 54 and 66 months.
Monday, October 31, 2011 at 5:29pm

statistics
A researcher is investigating whether, on average, 3rd grade males have significantly different creativity scores than 3rd grade females. She samples students from a large school district where she works. What is the independent variable?
Monday, October 31, 2011 at 4:44pm

statistics
Consider a 90% confidence interval for μ. Assume σ is not known. For which sample size n=10 or n=20, is the confidence interval longer?
Monday, October 31, 2011 at 2:51pm

Statistics
This problem does not make any sense to me!!! I would greatly appreciate your assistance, thanks. A recent survey showed 4.6 percent of the sample of 250 had suffered some kind of identity theft in the past 12 months. a. Construct a 90 percent confidence interval for the true ...
Monday, October 31, 2011 at 1:58pm

Statistics
This is my first stats class and I don't know how to do this, could you please help me? Thank you. You are asked to determine the typical number of sales of a certain product at the store you work for. A sample of 50 days over the last quarter shows an average of 55 units ...
Monday, October 31, 2011 at 1:55pm

Statistics
Please help!! I have no idea how to do this question. 14. A sample of 40 CD’s from your collection showed a mean length of 52.74 minutes with a standard deviation of 13.21 minutes a. Construct the 95 percent confidence interval for the mean. b. Construct the 95 percent ...
Monday, October 31, 2011 at 1:54pm

statistics
The First National Bank of Wilson has 680 checking account customers. A recent sample of 60 of these customers showed 32 to have a Visa card with the bank. Construct the 98 percent confidence interval for the proportion of checking account customers who have a Visa card with ...
Monday, October 31, 2011 at 12:10pm

statistics
Suppose that you have just taken a test and earned a score of 90%. Your instructor informs the class that the grades were normally distributed, that the average was 75%, and the standard deviation was 12%. Calculate your z-score to the hundredths place.
Monday, October 31, 2011 at 10:18am

Statistics
A recent article in the Myrtle Beach Sun Times reported that the mean labor cost to repair a color television is $90 with a standard deviation of $22. Monte’s TV Sales and Service completed repairs on two sets this morning. The labor cost for the first was $75 and it was...
Monday, October 31, 2011 at 9:19am

statistics
Math Answer: How much is 35 plus 78 minus 29 equals?
Monday, October 31, 2011 at 8:26am

Statistics
A mathematics class has 200 members. If there is 12% absentee rate per class meeting, find: a) mean, variance and standard deviation number of students who will be absent from each class. b) Draw the probability table and distribution graph of the number of the students absent.
Monday, October 31, 2011 at 4:43am

Statistics
During a national debate on changes to health care, a cable news service performs an opinion poll of 570 small-business owners. It shows that 72 percent of small-business owners do not approve of the changes. (a) Develop a 90 percent confidence interval for the proportion ...
Sunday, October 30, 2011 at 6:17pm

statistics
A survey is being planned to determine the mean amount of time corporation executives watch television. A pilot survey indicated that the mean time per week is 15 hours, with a standard deviation of 3.5 hours. It is desired to estimate the mean viewing time within one-quarter ...
Sunday, October 30, 2011 at 5:45pm

Probability
Reformatted so that it's easier to read. I have a Statistics project due tomorrow on Combinatorics. Admittedly, while my math skills aren't too bad (I get 99th percentile on standardized tests and such), it has been a while since I last took a math class after a 2-year...
Sunday, October 30, 2011 at 4:20pm

Mathematics (Probability, Statistics, etc.)
I have a Statistics project due tomorrow on Combinatorics. Admittedly, while my math skills aren't too bad (I get 99th percentile on standardized tests and such), it has been a while since I last took a math class after a 2-year lapse in education, so my skills are really ...
Sunday, October 30, 2011 at 3:57pm

Statistics
Suppose that a sample of 50 scores has a mean of Y=90 and the standard deviation is 15. Between what two values of Y will at least 90% of the scores fall? What is the maximun number of scores that can lie out of the interval?
Sunday, October 30, 2011 at 1:33pm

statistics
A sample mean with a z-score value between -1.00 and +1.00 would be considered a fairly typical representative sample. True or False
Sunday, October 30, 2011 at 10:17am

statistics
Suppose we have a population of scores with a mean (μ) of 200 and a standard deviation (σ) of 10. Assume that the distribution is normal. Provide answers to the following questions: What score would cut off the top 5 percent of scores? What score would cut off the ...
Saturday, October 29, 2011 at 11:46pm

statistics
In a sample of 100 steel wires the average breaking strength is 50 kN, with a standard deviation of 2 kN. a. Find a 95% confidence interval for the mean breaking strength of this type of wire. b. An engineer claims that the mean breaking strength is between 49.7 kN and 50.3 ...
Saturday, October 29, 2011 at 2:18pm

statistics
Gallup News Service conducted a survey of 1,006 American adults aged 18 years or older, September 24-27, 2007. The respondents were asked, “What, if anything, worries you most about your personal financial situation in he long term? ‘Of the 1,006 adults surveyed , 18...
Saturday, October 29, 2011 at 1:21pm

statistics
80% of students passed a class. 90% of those 80% did homework. Of the 20% that didn't pass, 60% of them did the homework. What is the probability of a student having done the homework?
Saturday, October 29, 2011 at 12:48am

statistics
can normal standard distribution have two modes?
Friday, October 28, 2011 at 9:40pm

statistics
Given x = 237;u=220 and s = 12.3 find z Help to at least start this
Friday, October 28, 2011 at 8:16pm

statistics
What percentage of the area would the empirical rule say is between -3.00 and +3.00
Friday, October 28, 2011 at 7:52pm

statistics
the average patient lasts 45 minutes on the tilt table. the current patient only lasted 15 minutes. if the standard deviation is 5 minutes. The Zscore that represents the current patients time of 15 minutes should be.
Friday, October 28, 2011 at 4:31pm

statistics
Find the value of zα/2 to construct a confidence interval with level: a. 95% b. 98%
Friday, October 28, 2011 at 4:25pm

Statistics
The closing price of Schnur Sporting Goods, Inc., common stock is uniformly distributed between $21 and 36 per share.Exercises What is the probability that the stock price will be: (a) More than $28
Friday, October 28, 2011 at 2:15pm

Statistics
Could someone help out with this question. The answer is 1842, but i'd like to know how to solve it. Thanks BCC wants to estimate the proportion of its students who are single parents. How many students should BCC survey if it wants to be 99% confident that the sample ...
Friday, October 28, 2011 at 10:47am

statistics
. There is a strongly linear association between the weight of a football player and the time in seconds it takes for that player to run a 100-yard dash. Knowing this, a reasonable value for the correlation r between weight and 100-yard dash time would be
Thursday, October 27, 2011 at 11:26pm

statistics
A distribution of values follows a N(140,22) distribution. From this distribution you are drawing samples of size 12. Find the interval containing the middle-most 34% of the sample means. Round your values to 1 decimal place.
Thursday, October 27, 2011 at 10:56pm

statistics
okay , so I had this questions on quiz today and I dont even remember the question properly but i wanted to know how you solve so I can see if I got it right questions : Imagine a college student is looking her chances of getting interview calls from A= calgary B= california P...
Thursday, October 27, 2011 at 9:05pm

statistics
We’re writing a test case that samples a “random” black box. Given n numbers, how many times would we need to sample the black box to have n unique responses with a 99.9% confidence? Eg, if we were rolling a six-sided die, how many times would we need to roll it...
Thursday, October 27, 2011 at 5:59pm

statistics
In 2006, the General Social Survey asked, "Do you see yourself as someone that tends to be lazy?" For this question, 20 people said that they definitely did out of 1513 randomly selected people. What is the 95% confidence interval for the proportion of all Americans ...
Thursday, October 27, 2011 at 12:45am

Statistics
One sample of n=20 scores has a mean of M=50. A second sample of n=5 scores has a mean of Mean=10. If the two samples are combined, what is the mean
Wednesday, October 26, 2011 at 11:58pm

statistics
Facebook reports that the average number of Facebook friends worldwide is 175.5 with a standard deviation of 90.57. If you were to take a sample of 25 students, what is the probability that the mean number Facebook friends in the sample will be 190 friends or more?
Wednesday, October 26, 2011 at 10:41pm

Statistics
Facebook reports that the average number of Facebook friends worldwide is 175.5 with a standard deviation of 90.57. If you were to take a sample of 30 students, what is the probability that the mean number Facebook friends in the sample will be 190 friends or more?
Wednesday, October 26, 2011 at 9:35pm

Statistics
Assume you want to estimate with the proportion of students who commute less than 5 miles to work within 2%, what sample size would you need?
Wednesday, October 26, 2011 at 9:33pm

Statistics
I am not sure if I can compare the measurments fro the above study with the standard normal distribution. I feel like I do not have enough data. Am I right or is it the standard normal distribution ? Medication at the end of life During the last month of life, residents were ...
Wednesday, October 26, 2011 at 5:36pm

Statistics
A survey organization takes a simple random sample of 625 households from a city of 80,000 households. On the average, there are 2.30 persons per sample household, and the SD is 1.75. Say whether each of the following statements are True or false and explain (a) The SE for the...
Wednesday, October 26, 2011 at 12:34pm

statistics
1. The on-campus housing costs for a semester at a state university are Normally distributed with a mean of $1553 and a standard deviation of $329. (a) What is the distribution of the mean on-campus housing cost for a semester at this university for a random sample of 50 ...
Wednesday, October 26, 2011 at 11:34am

statistics
For a hypothetical normal distribution of test scores, approximately 95% fall between 38 and 62, 2.5% are below 38, and 2.5% are above 62. Given this information, (a) the mode=_____ and (b) the standard deviation=_____.
Wednesday, October 26, 2011 at 9:39am

Statistics
How do you solve this? 28!/(28-28)!28! * 0.88^28 *0.12^28-28 I need help on how to solve this on a graphing calculator(TI-83 Plus) Can you help me? Please show step by step instructions! Thank you!!!
Tuesday, October 25, 2011 at 9:29pm

statistics
if out of 50 people, and 25 only attend what is the percentage
Tuesday, October 25, 2011 at 8:10pm

comm 100
You would cite the sources in your speech for all of the following except: 1.)if you use nonoriginal visual materials. 2).if you use literal analogies. 3.)if you use direct quotes or paraphrased information. 4.)if you use statistics. I swear I know this and I am drawing a ...
Tuesday, October 25, 2011 at 7:19pm

psychology
A theory can be defined as: a. an attempt to test behavior and thought process b. an accurate description of problem solving behavior c. the basis for relationships among unorganized facts and principles d. the applications of scientific method through statistics i think its A
Tuesday, October 25, 2011 at 3:02pm

statistics
A computer course is conducted for 24 days.Each day 48 persons attended the course.To prepare a day wise work done sheet for all 24 days,find the estimated and the actual number of persons attended the course.Is the estimated value more or less than the actual value?Find its ...
Tuesday, October 25, 2011 at 9:14am

Statistics
1. Consider a population with µ=73.6 and 0 = 5.38 (A) Calculate the z-score for x =72.7 from a sample of size 45. (B) Could this z-score be used in calculating probabilities using Table 3 in Appendix B of the text? Why or why not?
Tuesday, October 25, 2011 at 7:52am

statistics
3. At a cafeteria the customers arrive at an average of 0.3 per minute. The probability that a)exactly 2 customers arrive in a 10 minute span b)2 or more customers arrive in a 10 minute span c) one customer arrives in a 5 minute span and one customer arrives in the next minute...
Tuesday, October 25, 2011 at 5:03am

Psychology
Hypothesis Testing A researcher asks whether attending a private high school leads to higher or lower performance on a test of social skills when compared to students attending public schools. A sample of 100 students from a private school produces a mean score of 71.30. The ...
Tuesday, October 25, 2011 at 12:21am

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