# Homework Help: Math: Statistics

## Recent Homework Questions About Statistics

**statistics**

I have no idea how to solve this. In a sample of 16 students, 15 were right-handed. Can we construct a 95% confidence interval for the proportion of all students who are right-handed?

**statistics**

B} The average number of mosquitoes in a stagnant pond is 70 per square meter with a standard deviation of 8. If 36 square meters are chosen at random for a mosquito count, find the probability that the average of those counts is more than 70.9 mosquitoes per square meter. ...

**statistics**

a jar contains red and blue marbles. two marbles are chosen without replacement. the probability of choosing a red marble and then a blue marble is .26, and the probability of selecting a blue marble first is .43. what is the probability of selecting a red marble on the second...

**statistics**

at the tire store, 10 out of every 100 tires are defective. if your parents randomly choose and purchase 4 new tires for a family vehicle from a set of 100 newly shipped titres, what is the probability that all four will be defective

**statistics**

what is the difference between parameter and statistic

**statistics**

=weight of oranges in a 5-lb bag ~ N(m,0.2); (a) How many customers get cheated, if E(X)=5? (proportion p=________?) (b) What should m equal so that (a) p<16%, (b) 2.5%, (c) 0.5% ? (d) If the cost of oranges to the packer is $0.35, what is the respective cost of meeting ...

**Statistics**

It is reported that 72% of working women use computers at work. Choose 5 working women at random. Find a. The probability that at least 1 doesn't use a computer at work b. The probability that all 5 use a computer in their jobs

**statistics**

It is known that 10 % of a school's athlete population uses drugs. The Athletic Director gives a drug test which registers correctly as positive in 82 % of the cases where the drug is present and correctly as negative in 96 % of the cases where the drug is absent. One athlete...

**Statistics**

A sample of n=20 has a mean of M = 40. If the standard deviation is s=5, would a score of X= 55 be considered an extreme value? Why or why not? I understand that the score in question is 3 standard deviations above the mean. But I thought that I would need to convert this to a...

**Statistics**

A sample of n=20 has a mean of M = 40. If the standard deviation is s=5, would a score of X= 55 be considered an extreme value? Why or why not?

**Statistics**

In a population, heights of males are normally distributed with u=180 cm and sigma^2=16 cm^2, while the heights of females are normally distributed with u=170 cm and sigma^2= 25 cm^2. a) One random male and one random female are selected from the population i)What is the ...

**statistics**

For a certain yes/no survey question, 55% of the respondents answered “yes”. The null hypothesis is that the population is equally divided on this issue (50% yes and 50% no). The sample size is equal to your age. For a significance level (alpha) of 5%, are ...

**Statistics**

About 7% of men in the U.S. have some form of red-green color-blindness. Suppose we randomly select one U.S. adult male at a time until we find one who is red-green color-blind. How many men would we expect to choose, on average? Design and carry out a simulation to answer ...

**statistics**

what is the weight between 5.5 to 6 ounce when mean is 5,75 ounce and standard deviation is 0.11

**college statistics**

the math SAT scores for all students who applied to the school of engineering are normally distributed with M=629 and standard deviation of 60. the school of engineering has decided to accept those students whose scores fall in the top 15%. what is th minimum score an appliant...

**college statistics**

the average length of time required for students to complete a test in a an introductory statistics course is found to be 50 minutes with a standard deviation of 12 minutes. if students are allowed 80 minutes to complete the test , approximately what percentage of the students...

**Math/Statistics**

The number of megapixels in a digital camera is one of the most important factors in determining picture quality. But, do digital cameras with more megapixels cost more? The following data show the number of megapixels and the price ($) for 10 digital cameras (Consumer Reports...

**statistics**

Membership in Mensa requires an IQ score above 131.5. Nine candidates take an IQ test and their summary scores indicate that their mean IQ score is 133. IQ scores are normally distributed and have a mean of 100 and a standard deviation of 15. If nine people are randomly ...

**STATISTICS**

Suppose that, in order to estimate the proportion of students who wear glasses, a sample of 100 students was collected and showed that 20 of the students in the sample wore glasses. A confidence interval for the population proportion of students who wear glasses is given by: ....

**statistics**

Suppose that the ages of students at a particular university average 26 years with a standard deviation of 2.8 years. Consider the sampling distribution of the sample mean age of students in a sample of n = 49. The standard deviation of the sampling distribution is

**Statistics**

Daily water intake (including water used in drinks such as coffee, tea and juice) for Canadian adults follows a normal distribution with mean 1.5 litres and standard deviation 0.31 litres. (d) Using the 68-95-99.7 Rule, approximately 95% of samples of 22 Canadian adults will ...

**Statistics**

a Rollercoaster's auditors estimate that the average daily loss from those illegally riding without tickets is at lease (greater or equal) $295, but wants to determine the accuracy of this statistic. The company researcher takes a random sample of losses over 64 days and finds...

**statistics**

Waiting times at a doctor office are normally distributed with a mean of 35 minutes, and a standard deviation of 10 minutes. 25% of the patients have to wait less than how many minutes?

**statistics**

Suppose you are given data from a survey showing the IQ of each person interviewed and the IQ of his or her mother. That is all the information that you have. Your boss has asked you to put together a report showing the relationship between these two variables. What could you ...

**statistics**

Siegel found that elderly people who owned dogs were less likely to pay visits to their doctors after upsetting events than were those who didn’t own pets. Similarly, consider the following hypothetical data. A sample of elderly dog owners is compared to a similar group (in ...

**statistics**

What would be a nondirectional hypothesis for this statement. Older drivers are safer than younger ones. I have this not sure if it is correct. There will be a difference between older and younger drivers.

**statistics**

Waiting times at a doctor office are normally distributed with a mean of 35 minutes, and a standard deviation of 10 minutes. What is the chance a patient would have to wait over 50 minutes?

**statistics**

can you explain this to me please? Consider the binomial distribution where n = 11 and p = 0.05. Find the mean and standard deviation of this binomial distribution.

**college statistics**

how many ways can a 3 person committee be formed from 12 people

**statistics**

A couple considering a mortgage of $100,000 have a choice of loans. One loan is an 8% loan for 20 years, and the other loan is at 8% for 30 years. Find the amount of interest that the couple can save by choosing the 20-year loan.

**statistics**

(1) The director of a health club conducted a survey and found that 23% of members used only the pool for workouts. Based on this information, what is the probability that for a random sample of 10 members, 4 used only the pool for workouts? Round your answer to four decimal ...

**statistics**

The survival rate during a risky operation for patients with no other hope of survival is 81%. What is the probability that exactly four of the next five patients survive this operation?

**Statistics**

Service times for customers at a post office follow some right-skewed distribution with mean 2.91 minutes and standard deviation 1.74 minutes. (a) Can you calculate the probability that the average service time for the next two customers is less than 2.64 minutes? If you can...

**Statistics**

Daily water intake (including water used in drinks such as coffee, tea and juice) for Canadian adults follows a normal distribution with mean 1.86 litres and standard deviation 0.29 litres. (a) Can you calculate the probability that the mean daily water intake for a random ...

**statistics**

I this binomial? or No? A gumball machine contains 25 gumballs - 9 red, 6 blue, 7 green and 3 yellow. You buy five gumballs from the machine. X = number of green gumballs you get

**Statistics**

Random samples of size n = 90 were selected from a binomial population with p = 0.4. Use the normal distribution to approximate the following probabilities. (Round your answers to four decimal places.) (a) P(p̂ ≤ 0.49) = (b) P(0.37 ≤ p̂ ≤ 0.49) = ...

**statistics**

A random sample of 84 shoppers were interviewed and 51 said they prefer to shop alone rather than with someone else. Let p represent the proportion of all shoppers at this mall who would prefer to shop alone. Find a point estimate (p hat) for p.

**Statistics**

a city needs to perform some road maintenance and will rent excavator m achines from a company. Each excavator will work at least 1 hour, but no more than 4 hours at a time. It is known that the working time of each excavator is evenly distributed. a) What is the distribution ...

**statistics and probability**

A company manufactures washers, about 5% of which are defective. If a random sample of 100 washers are inspected, what is the probability that fewer than 4 are defective?

**statistics**

Suppose that in a large population the proportion of people that have a certain disease is 0.01. Use the Poisson approximation to find the probability that at least four people will have the disease in a group of 400 randomly selected people.

**Statistics**

It takes the bus an average of 20 minutes to arrive at a certain bus stop. A student is waiting for the next bus to arrive. a) What is the probability the student waits more than 30 minutes? b) What is the probability the student waits exactly 15 minutes? c) What is the ...

**statistics**

31% of a certain breed of rabbits are born with long hair. What is the probability that in a litter of 8 rabbits, exactly 5 will have long hair? (Give your answer correct to three decimal places.)

**Statistics**

a Rollercoaster's auditors estimate that the average daily loss from those illegally riding without tickets is at lease (greater or equal) $295, but wants to determine the accuracy of this statistic. The company researcher takes a random sample of losses over 64 days and finds...

**Statistics**

I have all the data, I just need someone to tell me how to start xc Please! I've been working on this for 5 hours now! 8. Calculate the equation of the least squares regression line. Draw this line on your scatter plot. The point (x,y) should lie on the line. Does it? Plot and...

**Statistics**

We're doing a project. I have all my data, but I'm not sure about what this is asking for. Use your regression equation to determine the purchase price for the 1999 Jeep Grand Cherokee. How does the predicted value, ŷ, compare to the average selling price, y, of your data...

**Statistics**

a. What is the probability that a sample of 50 male graduates will provide a sample mean within $.50 of the population mean, $21.68? b. What is the probability that a sample of 50 female graduates will provide a sample mean within $.50 of the population mean, $18.80? d. What ...

**statistics**

Can you step by srep dumb this down so that I can understand how to get the answer please? A set of 50 data values has a mean of 15 and a variance of 36. Find the standard score of a data value = 21

**statistics**

The physical plant at the main campus of a large state university receives daily requests to replace florecent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a mean of 37 and a standard deviation of 3. Using the empirical rule (as presented...

**statistics**

can you please explain the following so that I can understand how the numbers for each part was found: A set of 50 data values has a mean of 15 and a varience of 36. Find the standard score (z score) of a data value =21

**Statistics**

Carrie attained a score of 650 on the verbal section of her SAT. The mean grade was a 500 with a standard deviation of 100. What percentage of test takers scored below and above Carrie?

**statistics**

Assume that the readings on the thermometers are normally distributed with a mean of 0 degrees and standard deviation of 1.00 degrees C. A thermometer is randomly selected and tested. Draw a sketch and find the temperature reading corresponding to p subscript 99, the ...

**Statistics**

Where can I find the ti83 plus input functions for beginning statistics course

**statistics**

The tread life a certain brand of tires is known to be normally distributed with a mean of 60,000 miles and a standard deviation of 5,000 miles. The company wishes to set the warranty so that only 4% of the tires will need to be replaced. What should the warranty mileage be?

**statistics**

A company wishes to make 1 ounce candy bars. According to government regulations, in order to label the candy bars as 1 ounce, at least 95 % of the bars must weigh 1 ounce or more. Our process standard deviation is .08 ounces. What do we need to make the mean weight be so that...

**statistics**

For patients with a certain disease the amount of certain protein in the blood is normally distributed with a mean of 130 and a standard deviation of 5. For patients without the disease the amount of that protein is normally distributed with a mean of 150 and a standard ...

**Bio-Statistics**

Do you have any experience working with SPSS format

**statistics**

. For patients with a certain disease the amount of certain protein in the blood is normally distributed with a mean of 130 and a standard deviation of 5. For patients without the disease the amount of that protein is normally distributed with a mean of 150 and a standard ...

**statistics**

A company wishes to make 1 ounce candy bars. According to government regulations, in order to label the candy bars as 1 ounce, at least 95 % of the bars must weigh 1 ounce or more. Our process standard deviation is .08 ounces. What do we need to make the mean weight be so that...

**statistics**

The tread life a certain brand of tires is known to be normally distributed with a mean of 60,000 miles and a standard deviation of 5,000 miles. The company wishes to set the warranty so that only 4% of the tires will need to be replaced. What should the warranty mileage be?

**statistics**

If the mean I.Q. is 100 and the standard deviation of I.Q. scores is 15, then an I.Q. of 130 will have a z score (or standard score) of?

**Statistics**

Recent shootings in the united states of unarmed male african american by law enforcement officers has prompt renewed interest in racial inequality. Design a 10 questionaire that you believe could be used to access this problem. How to approach this questionnaire?

**statistics**

Suppose that the amount of time it takes the IRS to refund to taxpayers is normally distributed with a mean of 12 weeks and a variance of 9. a. What percent of taxpayers should get a refund within 5 weeks? b. What percent of taxpayers will get their refund within 10-15 weeks? ...

**Math: Statistics**

1. A regression analysis includes the effect of Age, which is categorised into five levels. How many dummy variables should be defined for including it in the analysis? 2. A regression analysis includes Sex as an explanatory variable. How many dummy variables are required to ...

**Statistics**

A simple random sample of 60 items resulted in a sample mean of 64. The population standard deviation is 16. a. Compute the 95% confidence interval for the population mean (to 1 decimal).

**research methods grant writing**

The table labeled “Brooklyn Precinct Activity Measures” shows counts of different indicators from the June 1999 Compstat report. All data are totals for the period January 1, 1999, through June 20, 1999. Notice, in the key to this table, that some indicators are based on ...

**research methods**

The table labeled “Brooklyn Precinct Activity Measures” shows counts of different indicators from the June 1999 Compstat report. All data are totals for the period January 1, 1999, through June 20, 1999. Notice, in the key to this table, that some indicators are based on ...

**statistics**

Two different samples drawn independently from the two district yielded the following results: District X: 1 x = 648, 2 1 s = 120, and 1 n = 100 District Y: 2 x = 495, 2 2 s = 140, and 2 n = 90 Verify at 0.05 level of significance whether the sample results support the claim ...

**Statistics**

According to a national poll conducted in 2010, seventy percent of teens reported having sent or received a text message while driving. Assume that I randomly survey 14 teens and asked them whether or not they have sent or received a text message while driving. a) What is the ...

**Statistics**

2. Given the cumulative distribution function (cdf) F(x)=(0 x<4 (x-4)/4 4 <= x <8 1 x >=8 2.1 Using the cdf, compute P(5<X<6). 2.2 What is the pdf of X? 2.3 Using the pdf, compute P(X<7). 2.4 What is E(X)? 2.5 What is V(X)?

**statistics**

For a normal distribution (symmetrical), a value that is two standard deviations below the mean would be closer to which of the following? Select one: a. 89th percentile b. Third Quartile c. Third percentile d. Median

**statistics**

how do I find the correlation coefficient r? Jesse put the heartbeat and lifespan data into a statistical software program and found the coefficient of determination is 0.45. The value of the correlation coefficient is __________.

**statistics**

given mean distance of 16 miles standard deviation of 8 miles with sample of 75 commuters what is probability of sample mean commute distance is greater that 13 miles Search instead for given mean distance of 16 miles standard deviation of 8 miles with sample of 75 commuters ...

**statistics**

Tasha examined the correlation between the weight and fuel economy of the 20 top-selling cars. She observed that the coefficient of determination was 62.3%. For this data, the value of the correlation coefficient, r, is __________.

**statistics**

A random sample of 16 mid-sized cars tested for fuel consumption gave a mean of 26.4 kilometers per liter with a standard deviation of 2.3. (a) Assuming that the kilometers per liter given by all mid-sized cars have a normal distribution, find a 99% confidence interval for the...

**statistics**

the marks of 100 students in an examination are normally distributed with mean of 25 marks and a standard deviation of 10 marks. Given that the pass mark is 20, estimate the number of students who passed the examination.

**Theories and issues in working with school-age chi**

According to the National Center for Educational Statistics, which of the following is a false statement? A. Boys are more likely than girls to fail or drop out of school. B. When it comes to grades and homework, boys outperform girls in elementary, secondary, high school, ...

**statistics**

A professor is interested in determining whether assigning mandatory homework affects students’ grades. He is currently teaching two sections of the same class; in one class, he assigns mandatory homework problems, while in the second class, he just recommends homework ...

**statistics**

A health psychologist, who is interested in childhood obesity, thinks that there may be a relationship between daily television viewing and eating habits. Data is collected from 500 children; for each child, information is collected on the number of hours of daily television ...

**statistics**

Researchers investigated the effects of encoding conditions on subsequent memory for a list of words. Participants were assigned to one of three encoding conditions: 1) saw list of nouns they were asked to remember (word alone condition), 2) list of words was accompanied by a ...

**STATISTICS HELP!!!!!**

Bender Electronics buys keyboards for its computers from another company. The keyboards are received in shipments of 175 boxes, each box containing 30 keyboards. The quality control department at Bender Electronics first randomly selects one box from each shipment and then ...

**Statistics**

Bender Electronics buys keyboards for its computers from another company. The keyboards are received in shipments of 75 boxes, each box containing 30 keyboards. The quality control department at Bender Electronics first randomly selects one box from each shipment and then ...

**statistics**

The physical plant at the main campus of a large state university receives daily requests to replace florecent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a mean of 46 and a standard deviation of 9. Using the empirical rule (as presented...

**Statistics**

The marks of 100 students in an examination are normally distributed with mean of 25 marks and a standard deviation of 10 marks. (a) Given that the pass mark is 20, estimate the number of students who passed the examination. (b) If 5.59% of the students obtain a distinction by...

**statistics**

3. Community Health Center, a new patient clinic in your town serving only underinsured and uninsured patients, has asked you to help its HIM department. Calculate the number of shelving units needed for a medical record filing system based on eight shelves per unit at 36 ...

**Statistics**

Assume that X, the starting salary offer to psychology majors is normally distributed with a mean of $47,507 and a SD of $5000. 1. The probability that a randomly selected psychology major received a starting salary offer greater than $52,000 is______. 2. The probability a ...

**statistics**

An instructor in a large lecture class found at the end of the semester that total points scored by students in his class was approximately Normal with mean 530 and standard deviation 80. If 10% of the class are to receive A's (he grades on a curve), what is the lowest number ...

**Business Statistics**

Customers arrive at a movie theater at the advertised movie time only to find that they have to sit through several previews and prepreview ads before the movie starts. Many complain that the time devoted to previews is too long (The Wall Street Journal, October 12, 2012). A ...

**statistics**

n employee produces 2,080 hours of work in the course of a year, how many employees will be required for the coding area if the coding time on average for one record is 30 minutes and there are 12, 500 records that must be coded each year?

**statistics**

A researcher is interested in determining whether acupuncture affects pain tolerance. An experiment is performed in which 15 students are randomly chosen from a large pool of university undergraduate volunteers. Each subject serves in two conditions. In both conditions, each ...

**statistics**

The p value is the: a. probability with which a test statistic would occur if the research hypothesis were true. b. probability with which a test statistic would occur if the null hypothesis were true. c. cutoff probability at which a test statistic is considered extreme. d. ...

**Statistics**

Graduation rate for students in a program is 80%. If 10 students from it are selected at random, find the probability that AT LEAST 8 of them graduated.

**Statistics**

A student makes random guesses on 6 multiple-choice questions. One of the 5 choices in each question is correct. What is the probability that the student will get at most 4 answers right?

**Statistics**

Astudent makes random guesses on 6 multiple-choice questions. One of the 5 choices in each question is correct. What is the probability that the student will get at most 4 answers right?

**statistics**

A research organization claims that the monthly wages of industrial workers in district X exceeds that of those in district Y by more than Rs 150. Two different samples drawn independently from the two district yielded the following results: District X: x1 = 648, s12 = 120, ...

**Statistics**

Data Set A: Average = $157 Standard Dev. = $84 Data Set B: Average = 34 oz. Standard Dev. = 21 oz Which Data Set is more variable?

**English-Annotation Please Help**

In the recent years, the media has shared with the public two very different stories involving children who committed acts of violence. Both minors were charged with murder and sent to adult state prison to serve their prison sentences. Some people may believe these teens ...

**statistics**

The p value is the: a. probability with which a test statistic would occur if the research hypothesis were true. b. probability with which a test statistic would occur if the null hypothesis were true. c. cutoff probability at which a test statistic is considered extreme. d. ...

**statistics**

Use the z-table to find the requested probabilities. Enter your answers to 4 decimal places. (a) P(z < −1.02) = Incorrect: Your answer is incorrect. (b) P(z ≥ 2.43) = (c) P(−1.80 < z < 1.36) =

**statistics**

Assume heights and weights are normally distributed with the given means and standard deviations from the table below. Strata Mean Standard Deviation Mean Standard Deviation Height Height Weight Weight (inches) (inches) (pounds) (pounds) U.S. Men 69.3 2.8 191 28 U.S. Women 64....

**statistics**

The bass in Clear Lake have weights that are normally distributed with a mean of 1.9 pounds and a standard deviation of 0.8 pounds. (a) If you catch 3 random bass from Clear Lake, find the probability that the mean weight is less than 1.0 pound. Round your answer to 4 decimal ...