Homework Help: Math: Statistics

Recent Homework Questions About Statistics

Statistics
Problem 6 A histogram shows the number of hours students spent preparing for a test. The table below gives the intervals and the heights of the bars (in percent per hour). Intervals contain the left endpoint but not the right. No student spent 25 hours or more in preparation. ...
Monday, February 25, 2013 at 3:30am

Statistics
Problem 5 In a histogram of lengths measured in millimeters, the height of the 20-40 bar is 1 percent per millimeter. If I measure all the lengths in centimeters instead, then the corresponding bar would be labeled 2-4. : 5.0 points The height of this bar would be: 1 percent ...
Monday, February 25, 2013 at 3:29am

Statistics
Problem 1 The distribution of ages in the United States in the year 2010 is given below. Intervals include the left endpoint but not the right; the number of people aged 100 or more was not zero but it was so small that it makes no difference to the table. You can assume that ...
Monday, February 25, 2013 at 3:27am

Statistics
The distribution of ages in the United States in the year 2010 is given below. Intervals include the left endpoint but not the right; the number of people aged 100 or more was not zero but it was so small that it makes no difference to the table. You can assume that the ages ...
Monday, February 25, 2013 at 3:26am

Statistics
Here is a distribution you have seen before, in Exercise Set 2. It is the distribution of ages in the United States in the year 2010 is given below. Intervals include the left endpoint but not the right; the number of people aged 100 or more was not zero but it was so small ...
Monday, February 25, 2013 at 3:25am

P Value Math Statistics
Find the P-value for the indicated hypothesis test with the given standardized test statistics, z. Decide whether to reject H0 for the given level of significance a. two-tailed test with test statistic z= -1.57 and a=0.04
Sunday, February 24, 2013 at 11:23pm

Statistics
Which of the following is an accurate description of Simpson's paradox? When groups of data are aggregated, an association can get stronger because of a confounding variable. That confounding variable is usually the number of observations in different groups of data. When ...
Sunday, February 24, 2013 at 11:07pm

statistics
In a normal distribution with mu = 25 and sigma = 3, what number corresponds to z = -3? is it 16, 18, or 20
Sunday, February 24, 2013 at 9:17pm

statistics
how to find the tatge cf when using the score at a given percentile ?
Sunday, February 24, 2013 at 3:09pm

statistics
how to find the target cf when using the formula for score at a given percentile ?
Sunday, February 24, 2013 at 3:06pm

statistics
A store manager claims that the average age of his customers is less than 40 years old, while the industry average is 40 years old. He asks you to test his thinking. You collect a sample of 50 customers and found that the average age is 38.7. Assuming that the population ...
Sunday, February 24, 2013 at 1:15pm

statistics
Accuracy of price scanners at Wal-Mart. The National Institute for Standards and Technology (NIST) mandates that for every 100 items scanned through the electronic checkout scanner at a retail store, no more than 2 should have an inaccurate price. A recent study of the ...
Sunday, February 24, 2013 at 12:32am

Math Statistics
The sorting algorithm known as bogosort can be described in pseudocode as: while not isSorted(input): shuffle(input) If we feed bogosort a shuffled array of length n of unique items the distribution of the number of times bogosort checks if the array is sorted (...
Saturday, February 23, 2013 at 8:52pm

statistics
approximately 300 millions golf balls were lost in the united states in 2009 assume the number of gold balls lost in an 18 hole is distributed as a poisson random variable with a mean of 5 balls
Saturday, February 23, 2013 at 12:51am

statistics
For a population of μ = 70 and σ = 20, find the z-score and percentile rank for each of the following X scores: 80, 100, 65, 40.
Friday, February 22, 2013 at 10:13pm

statistics
What is the standard deviation of 31 sample values with a mean of 2954?
Friday, February 22, 2013 at 11:47am

science
3. In a sample of 64 students given an examination in statistics, it is found that the mean weight is 57 kg with standard deviation 9 kg. Find : ƒÜ i) The proportion of students weight 48-62 kg. ƒÜ ii) The proportion of those less than 72 kg. ƒÜ ...
Friday, February 22, 2013 at 7:04am

statistics
otorola discovered that the average defect rate for parts produced on an assembly line varies from run-to-run and is approximately normally distributed with a mean equal to 3 defects per million. Assume that the goal at Motorola is for the average defect rate to vary no more ...
Friday, February 22, 2013 at 1:10am

statistics
what is percentage of scores between37.5 and 39
Thursday, February 21, 2013 at 10:00pm

statistics
A sum of twelve given a pair of sixes. give explanation
Wednesday, February 20, 2013 at 12:22pm

statistics
A high school counselor wants to examine whether the teenage pregnancy rate at her school is different from the rate nationwide. She knows that the rate nationwide is 15 %. She randomly selects 80 female students from her high school. She finds that 9 out of 80 students are ...
Tuesday, February 19, 2013 at 9:56pm

Statistics
A candidate for a political office claims that he will win the election. A poll is conducted, and 35 of 150 voters indicate that they will vote for the candidate, 100 voters indicate that they will vote for his opponent, and 15 voters are undecided. a. What is the population ...
Tuesday, February 19, 2013 at 7:37pm

Statistics
In your biology class, your final grade is based on several things: a lab score, scores on two major tests, and your score on the final exam. There are 100 points available for each score. However, the lab score is worth 15% of your total grade, each major test is worth 22.5...
Tuesday, February 19, 2013 at 5:06pm

Statistics
Cola Corporation produces Orange Cola. The filling machines are adjusted to pour 12 ounces of soda into each 12-ounce can. However, the actual amount of soda poured into each can is not exactly 12 ounces; it varies from can to can. It has been observed that the net amount of ...
Tuesday, February 19, 2013 at 11:57am

statistics
sing the proper average, find the average number of grams of fat per ounce of meat or fish that a person would consume over a 5-day period if he ate these: 3 oz fried shrimp 3.33 g/oz of fat 3 oz veal cutlet 3.00 g/oz of fat 2 oz roast beef 2.5 g/oz of fat 2.5 oz fried chicken...
Monday, February 18, 2013 at 9:03pm

statistics
The average weekly earnings in dollars are listed below. What value corresponds to the 40th percentile? 804 736 659 489 777 623 597 524 228
Monday, February 18, 2013 at 8:57pm

math Statistics
Suppose that 33 out of 300 selected american drivers read the newspaper while driving. what percent of sample proportions are greater than this?
Monday, February 18, 2013 at 6:41pm

statistics
Sugar packaged by a certain machine has a mean weight of 5 lb and a standard deviation of 0.04 lb. For what values of c can the manufacturer of the machinery claim that the sugar packaged by this machine has a weight between 5 − c and 5 + c lb with probability at least ...
Monday, February 18, 2013 at 5:09pm

Statistics
Suppose a data set has a linear regression line of y = 6 -0.8x. If the mean of the x's is 5, what is the mean of the y's? 2 5 10 6 None of the above
Monday, February 18, 2013 at 5:04pm

Statistics
In order to compare two kinds of feed, thirteen pigs are split into two groups, and each group received one feed. The following are the gains in weight (kilograms) after a fixed period of time: Feed A: 8.0 7.4 5.8 6.2 8.8 9.5 Feed B: 12.0 18.2 8.0 9.6 8.2 9.9 10.3 We wish to ...
Monday, February 18, 2013 at 3:56pm

Statistics
Community Hospital had 23,652 admissions. Of these, 1569 were readmissions. What is the hospital's readmission rate?
Sunday, February 17, 2013 at 8:04pm

Statistics
These are the only ones that I am having problems with. Please help.. 8.You are given the sample mean and the sample standard deviation. Use this information to construct the 90% and the 95% confidence intervals for the population mean. Interpret the results and compare the ...
Sunday, February 17, 2013 at 7:05pm

Math Statistics
The life span of three randomly selected tires are 34,700 miles, 43,000 miles, 39,000 miles. Using the empirical rule, find the percentile that corresponds to each life span.
Sunday, February 17, 2013 at 4:26pm

Statistics
The life spans of three randomly selected tires are 31,950 miles, 36,050 miles, 34,000 miles. Using the empirical rule, find the percentile that corresponds to each life span.
Sunday, February 17, 2013 at 3:54pm

Probability & Statistics
32% of women consider themselves fans of professional baseball. You randomly select six women and ask each if she considers herself a fan of professional baseball.
Sunday, February 17, 2013 at 12:01am

Statistics
A recent survey found that 70% of all adults over 50 wear glasses for driving. You randomly select 30 adults over 50, and ask if he or she wears glasses. Decide whether you can use the normal distribution to approximate the binomial distribution. If so, find the mean and ...
Saturday, February 16, 2013 at 8:38pm

Statistics
An airline reports that if has been experiencing a 15% rate of no-shows on advanced reservations. Among 150 advanced reservations, find the probability that there will be fewer than 20 no-shows.
Saturday, February 16, 2013 at 8:36pm

Statistics
A brewery's filling machine is adjusted to fill bottles with a mean of 32.6 oz. of ale and a variance of 0.004. Periodically, a bottle is checked and the amount of ale noted. (a) Assuming the amount of fill is normally distributed, what is the probability that the next ...
Friday, February 15, 2013 at 9:01pm

statistics
A television program director has 14 shows available for Monday night and 5 shows must be chosen. How many different possible combinations are there?
Friday, February 15, 2013 at 11:55am

math
Which would be more beneficial for someone (who intends on going to a university) to take senior year of high school: AP Statistics or AP Calculus?
Thursday, February 14, 2013 at 10:49pm

statistics
Claim: The majority of adults like pizza. A sample of 400 randomly selected adults shows that 220 of them like pizza. Based on the given sample information, do you think that the above claim is true? Why or why not?
Thursday, February 14, 2013 at 3:16pm

statistics
if a sample of a distribution of sample size 26 has a range of 56, then what would be an estimate of the sample standard deviation
Thursday, February 14, 2013 at 1:02pm

Statistics
If student A scored 42 on a test of reading and the test had a mean of 52 and a standard deviation of 8, what percentage of test respondents scored below student A?
Wednesday, February 13, 2013 at 11:50pm

statistics
A horse race has 14 entries. Assuming that there are no ties, what is the probability that 5 horses owned by 1 person finish first, second, third, fourth, and fifth?
Wednesday, February 13, 2013 at 9:59pm

Statistics
how to round 0.2055 to 3 decimals
Wednesday, February 13, 2013 at 5:55pm

statistics
From a shipment of 350 batteries, a sample of 125 was selected at random and tested. If 25 batteries in the sample were found to be dead, how many dead batteries would be expected in the entire shipment?
Wednesday, February 13, 2013 at 3:17pm

statistics
Suppose that neighborhood soccer players are selling raffle tickets for $500 worth of groceries at a local store, and you bought a $1 ticket for yourself and one for your mother. The children eventually sold 1,000 tickets. (a) What is the probability that you will win? (b) ...
Wednesday, February 13, 2013 at 2:08pm

statistics
1.A magazine reported that 6% of Americans read the news paper while driving. 100 drivers are selected at random, find the probability that exactly 25 of them say they read the newspaper while driving.(normal binomial formula to solve) 2. A survey of 30 adults found that the ...
Wednesday, February 13, 2013 at 1:09pm

statistics
ten randomly selected people were asked how long they slept at night. The mean time was 7.1 hours and the (sample) standard deviation was 0.78 hours. Find the 95% confidence interval of the mean time. Assume the variable is normally distributed.
Wednesday, February 13, 2013 at 1:08pm

statistics
how could you reword these research hypoteses to null hypoteses? a) smoking during pregnancy increse the risk of a child being born orematurely. b) regular exercise in older adults decreases blood pressure levels.
Tuesday, February 12, 2013 at 11:36pm

Statistics
1. Each of 4 people is presented with gourmet coffee and ordinary coffee and asked to identify the gourmet coffee. None of the 4 can really tell the difference and are merely guessing. a. What is the probability that exactly 2 of the 4 correctly identify the gourmet coffee? b...
Tuesday, February 12, 2013 at 5:18pm

Statistics
Find 3 different research questions and the appropriate data one needs to collect for each, including the level(s) of the data to be collected for each question.
Tuesday, February 12, 2013 at 4:04pm

statistics
A population has a mean =80 and a standard deviation =8. find the mean and standard deviation of a sampling distribution of sample means with sample size=64
Tuesday, February 12, 2013 at 10:39am

statistics
Using the definition of recovery provided in W1: Assignment 5, determine how many participants recovered at the end of posttreatment and use a chi-square analysis to compare recovery rates across the three treatments at both posttreatment and follow-up. Integrate your chi-...
Tuesday, February 12, 2013 at 9:30am

Statistics
Find the probability that for a random sample of 4 states the sample mean x is between 475 and 525
Tuesday, February 12, 2013 at 1:11am

STATISTICS
ASSUME THE THE MEAN WEIGHT OF CHILDREN AGES 7 IS 50 POUNDS AND A STANDARD DEVIATION OF 10. wHAT IS THE PROBABLITY THAT A RANDOM SELECTED 7 YEAR OLD WILL HAVE A WEIGHT THAT IS LESS THAT 65
Monday, February 11, 2013 at 5:31pm

Statistics
Research design is an area where researchers collect various data to address important questions. For example, if researchers wish to find characteristics of people most likely to develop lung cancer, they will have to collect appropriate data first. Investigate 3 different ...
Monday, February 11, 2013 at 3:50pm

Statistics- HELP!
2. The Rathburn Manufacturing Company makes electric wiring, which it sells to contractors in the construction industry. Approximately 900 electric contractors purchase wire from Rathburn annually. Rathburn's director of marketing wants to determine electric contractors&#...
Monday, February 11, 2013 at 1:48pm

Statistics
Each of 4 people is presented with gourmet coffee and ordinary coffee and asked to identify the gourmet coffee. None of the 4 can really tell the difference and are merely guessing. a. What is the probability that exactly 2 of the 4 correctly identify the gourmet coffee? b. ...
Monday, February 11, 2013 at 1:34am

Statistics
Each of 4 people is presented with gourmet coffee and ordinary coffee and asked to identify the gourmet coffee. None of the 4 can really tell the difference and are merely guessing. a.What is the probability that exactly 2 of the 4 correctly identify the gourmet coffee? b.What...
Monday, February 11, 2013 at 1:16am

Statistics
Each of 4 people is presented with gourmet coffee and ordinary coffee and asked to identify the gourmet coffee. None of the 4 can really tell the difference and are merely guessing. a.What is the probability that exactly 2 of the 4 correctly identify the gourmet coffee? b.What...
Monday, February 11, 2013 at 1:15am

statistics
this is a problem in my statistics class, and I am lost to me, it is confusing or missing something here is the problem please help grade points are assignede as follows: a=4,b=3,c=2,d=1,f=0. grades are weighted according to credit hours. if a student receives an A in a four-...
Sunday, February 10, 2013 at 10:42pm

statistics
can a placebo be an explanatory variable?
Sunday, February 10, 2013 at 8:10pm

statistics
The mean of 3 consecutive multiples of 3 is equal to A.The mean of 4 consecutive multiples of 4 is equal to A + 27. The mean of the smallest and largest of these 7 numbers is 42. Find A
Sunday, February 10, 2013 at 6:36pm

Statistics
The lengths of pregnancies are normally distributed with a mean of 273 days and a standard deviation of 20 days. If 64 women are randomly selected, find the probability that they have a mean pregnancy between 273 days and 275 days.
Sunday, February 10, 2013 at 4:32pm

Statistics
The body temperatures of adults are normally distributed with a mean of 98.6 degree F and a standard deviation of 0.60 degree F. If 36 adults are randomly selected, find the probability that their mean body temperature is greater than 98.4 degree F.
Sunday, February 10, 2013 at 4:31pm

Statistics
If the probability of a newborn child being female is 0.5, find the probability that in 100 births, 55 or more will be female. Use the normal distribution to approximate the binomial distribution.
Sunday, February 10, 2013 at 4:28pm

statistics
The mean scale score on the mathematics examinatin of ninth graders in Texas was 86 with a standard deviation of 5 points. Given a student was selected at random what is the probability tht his score was 91 or higher
Sunday, February 10, 2013 at 4:01pm

statistics
a vending machine dispenses coffee into an 8 oz cup. the amount of coffee dispensed into the cup is normally distributed with a standard deviation of 0.03 oz.you can allow the cup to overfill 5 percent of the time. what amont should you set as the mean amount of coffee to be ...
Sunday, February 10, 2013 at 2:46pm

math statistics
Marathon runners were randomly assigned to receive either vitamin C or a placebo. Separately, these treatments were also randomly assigned to a group of nonrunners the same age as the runners. All subjects were watched for 2 weeks after the race to see if infections developed...
Sunday, February 10, 2013 at 1:00pm

Statistics
There are two different formulas or methods that can be used to calculate SS. under what circumstances is the definitional formula easy to use?
Sunday, February 10, 2013 at 11:43am

Math-Statistics
An advisor offers 8 mutual funds in the high risk category, 7 moderate, 10 in low risk. The investor decides to invest in 3 high risk, 4 moderate risk, and 10 low risk. How many ways can he do this?
Sunday, February 10, 2013 at 9:36am

Statistics
An advisor offers 8 mutual funds in the high risk category, 7 moderate, 10 in low risk. The investor decides to invest in 3 high risk, 4 moderate risk, and 10 low risk. How many ways can he do this?
Saturday, February 9, 2013 at 5:04pm

Statistics
5 selected from batch of 50 produced, if one is found defective, than each is tested individually. Find the probability that the entire batch will need testing if the batch contains: 8 defective phones 2 defective phones
Saturday, February 9, 2013 at 4:55pm

statistics
A set of data consists of 90 observations between 350 and 950. a) What rule would you use to find the number of classes? Use this rule to determine the number of classes? b) What formula would you use to determine the class width or length? Use that formula to determine the ...
Saturday, February 9, 2013 at 4:29pm

statistics
the mean scale score on the mathematics examination of ninth grade students in new york state was 86 with a standard deviation of 5 points. Given a student was selected at random what is the probabilty that his score was 91 or higher?
Saturday, February 9, 2013 at 3:43pm

statistics
a towns snowfall in december averages 13 inches with a standard diviation of 8 inches while in february the average snowfall is 40 inches with a standard deviation of 13 in which month is it more likey to snow 32 inches. explain
Saturday, February 9, 2013 at 1:34pm

statistics
A local country club has a membership of 600 and operates facilities that include an 18-hole championship golf course and 12 tennis courts. Before deciding whether to accept new members, the club president would like to know how many members regularly use each facility. A ...
Saturday, February 9, 2013 at 2:22am

Statistics
An Adviser has 9 products he wants to tell a client about, but only has time to tell him about 4. How many different ways can he give the details on 4 different products to the customer?
Friday, February 8, 2013 at 11:24am

philosophy
I am to write a eight to ten page research paper based upon a current event/ pressing social issue that is relevant in my community. I want to write about crime but crime is not very prevalent in my town until recently we had like 4 murders in the last month. Do you think I ...
Friday, February 8, 2013 at 12:08am

statistics
A study found that 81% of households in the United States have computers. Of those 81%, 92% have Internet access. Find the probability that a U.S. household selected at random has a computer and has Internet access.
Thursday, February 7, 2013 at 10:05pm

Math HELLPPPPP
Invent a dataset with five values, with a mean smaller than the median and both the mean and median smaller than the standard deviation. give the data values and the statistics. Mean= Median= Standard Deviation=
Thursday, February 7, 2013 at 7:41pm

Statistics Helppppp
Invent a dataset with five values, with a mean smaller than the median and both the mean and median smaller than the standard deviation. give the data values and the statistics. Mean= Median= Standard Deviation=
Thursday, February 7, 2013 at 3:13pm

Statistics
A study of reading ability in schoolchildren chose 60 fifth-grade children at random from a school. The researchers had children's scores on an IQ test and on a test of reading ability. An eccentric professor has his own idea of the relationship between IQ and reading ...
Wednesday, February 6, 2013 at 9:22pm

statistics
Of the 5,352 requests for medical records in the question above, 4,257 were located within the 20-minute time frame established by the supervisor as a quality improvement indicator. What is the rate of compliance in answering requests for records? Round to two decimal points.
Wednesday, February 6, 2013 at 2:31pm

Statistics
A telephone company's records indicate that private customers pay on average $17.10 per month for long-distance telephone calls. A random sample of 10 customers' bills during a given month produced a sample mean of $22.10 expended for long-distance calls and a sample ...
Tuesday, February 5, 2013 at 10:20pm

Statistics
Which of the following conditions doesn't need to be met before you can use a two-sample procedure? The responses in each group are independent of each other. Each group is considered to be a sample from a distinct population. The same variable is measured in both samples...
Tuesday, February 5, 2013 at 9:32pm

stats
Relatively speaking, which statistics exam did you do better on? On your first statistics exam you scored a 72 and on the second exam you scored an 89. Hey, you’re improving! Or are you? On the first exam, the class mean was 71 with a standard deviation of 15. On the ...
Tuesday, February 5, 2013 at 9:21pm

Statistics-Probability
An instructor will choose 3 problems from a set of 7 containing 3 hard and 4 easy problems. If the selection is made at random, what is the probability that only the hard problems are chosen?
Tuesday, February 5, 2013 at 12:36pm

Statistics
A bag contains two blue, three purple, four yellow, two red, three green and one orange marbles.p> What is the conditional probability that, without replacement, the second marble is purple given that the first marble is green?
Monday, February 4, 2013 at 5:14pm

statistics
Randomly select 100 purchases from your checkbook or 100 credit card purchases that you have made in the past year. Do not mix checks and credit card purchases; pick one or the other for this study. Would you expect the cents portion of the checks to be evenly represented? ...
Monday, February 4, 2013 at 2:33pm

statistics
Suppose that, in fact, the blood cholesterol level of all men aged 20 to 34 follows the normal distribution with mean of u = 188 milligrams per deciliter (mg/dl) and standard deviation = 41 mg/dl. 1. Choose an SRS of 100 men from this population. What is the sampling ...
Monday, February 4, 2013 at 12:08pm

Statistics
A company manufactures calculators in batches of 64, and there is a 5% defect rate. Find probability of getting at least three defects
Monday, February 4, 2013 at 2:17am

statistics
1. The scores on a standardized test for high school students are normally distributed with a population mean of 500 and a population standard deviation of 100. Use the empirical rule (0LI refers to this as the standard deviation rule.). Make sure you provide graphs for each ...
Sunday, February 3, 2013 at 12:26pm

Statistics
Accidents on a bike path. Examining the location of accidents on a level, 5-mile bike path shows that they occur uniformly along the length of the path. Figure 3.4 displays the density curve that describes the distribution of accidents. (a) Explain why this curve satisﬁ...
Saturday, February 2, 2013 at 4:35pm

statistics
Suppose 1,600 of 2,000 registered voters sampled said they planned to vote for the Independent candidate for president. Using the 0.95 degree of confidence, what is the interval estimate for the population proportion (to the nearest tenth of a percent)? How to calculate in ...
Saturday, February 2, 2013 at 1:49pm

history us
How does the current distribution of wealth in the U.S. compare to 1929? Include statistics. I really need help someone.
Friday, February 1, 2013 at 1:56pm

Statistics
Suppose that, in fact, the blood cholesterol level of all men aged 20 to 34 follows the normal distribution with mean of u = 188 milligrams per deciliter (mg/dl) and standard deviation = 41 mg/dl. 1. Choose an SRS of 100 men from this population. What is the sampling ...
Wednesday, January 30, 2013 at 10:17pm

Statistics
If the standard deviation of a sample is 4.3 for 28 data values, what would the standard deviation be fore the population from which the sample was drawn?
Wednesday, January 30, 2013 at 7:19pm

statistics
entify the data set's level of measurement. gender profile of the 111th congress average january snowfall for 15 cities
Wednesday, January 30, 2013 at 5:49pm

Math
Having trouble with a statistics question. If you have 2 groups..group A and group B and Group A's times in seconds are 3, 7, 8, 25, 132, and 132 and Group B's times are 2,3, 5,7,23,33,40, 44, 46, 51, 70, 125, and 134...which group overall found the hidden candy the ...
Wednesday, January 30, 2013 at 7:38am

statistics
in certain lottery, you must select 6 numbers (in any order)out of 37 correctly to win. a)How many ways can 6 numbers be chosen out of 37 numbers?
Tuesday, January 29, 2013 at 10:17pm

Statistics
How will I know the modal class from a grouped data w/ equal class sizes if the highest frequency is 7 but then it appears thrice in 3 intervals. 34.00 - 39.69 frequency: 7 39.70- 45.39 frequency: 7 62.50-68.19 frequency: 7
Tuesday, January 29, 2013 at 4:12am

Statistics
You have received a year-end bonus of $5000. You decide to invest the money in the stock market and have narrowed your investment options down to two mutual funds. the following data represent the historical quarterly rates of return of each mutual fund for the past 20 ...
Monday, January 28, 2013 at 6:55pm

statistics
For a particular sample of 53 scores on a psychology exam, the following results were obtained. First quartile = 44 Third quartile = 68 Standard deviation = 8 Range = 55 Mean = 54 Median = 54 Mode = 71 Midrange = 64 I. What score was earned by more students than any other ...
Sunday, January 27, 2013 at 6:44pm

Statistics
Mrs. Marble gave her 5th grade class a math test. The scores reflect a relatively normal distribution. The mean score for the group was 80 with a standard deviation of 8. Based upon this information, answer the following questions: Bobby scored exactly two standard deviations ...
Sunday, January 27, 2013 at 5:51pm

Statistics
A population has a mean of 30 and a standard deviation of 5. a. If 5 points were added to every score in the population, what would be the new values for the mean and standard deviation? b. If every score in the population were multiplied by 3 what would be...
Saturday, January 26, 2013 at 2:35pm

Statistics
The Tribune claims that the time of travel from downtown to the University via the bus has an average of µ = 27 minutes. A student who normally takes this bus believes that µ is greater than 27 minutes. A sample of six ride times taken to test the hypothesis of ...
Friday, January 25, 2013 at 11:12pm

Statistics
A college’s data about the incoming freshmen indicates that the mean of their high school GPAs was 3.4, with a standard deviation of 0.35; the distribution was roughly mound-shaped and only slightly skewed. The students are randomly assigned to freshman writing sem- inars...
Friday, January 25, 2013 at 11:57am

statistics
Suppose that you are evaluating two different alternatives. The inflated cost stream for alternative A is $8,000 for year 1, $9,000 for year 2, $12,000 for year 3, 12,000 for year 4, and $13,000 for year 5. The inflated cost stream for alternative B is $10,000 for year 1, $12,...
Friday, January 25, 2013 at 3:36am

Statistics
It is believed that at least 60% of voters from a certain region in Canada favor the free trade agreement (FTA). A recent poll indicated that out of 400 randomly selected individuals, 250 favored the FTA. If we wished to perform a test to determine whether the proportion of ...
Thursday, January 24, 2013 at 11:13pm

Statistics
What is the P(H,H,T,T) on four flips of a coin?
Thursday, January 24, 2013 at 8:21pm

Statistics
Which of the following statements is not true about samples that can be treated as matched pairs data? I. Data collected on these samples is analyzed by calculating the differences between paired observations and using that data in one sample tests. II. Each value in the first...
Thursday, January 24, 2013 at 3:22pm

Statistics
The estimated standard error, sM, provides a measure of the average or standard distance between _____. a score and the population mean (X and ì) a sample mean and the population mean (M and ì) a score and the sample mean (X and M) None of the other options is ...
Wednesday, January 23, 2013 at 1:17pm

statistics
The average life of Canadian women is 73.75 years and the standard deviation of the women's life expectancy in Canada is 6.5 years. Using the Chebyshev's theorem, determine the minimum percentage of women in Canada whose life expectancy is between 64 and 83.5 years. ...
Tuesday, January 22, 2013 at 6:25pm

Statistics
I have another Stats question i'm confuesed on. classify the sample as random, systematic, covenience, stratified, or cluster. A marketing executive fo General Motors finds that its public department has just printed envelopes with the names and addresses of all Corvette ...
Monday, January 21, 2013 at 9:14pm

Statistics
I have a question about one of my Stats vocab questions. any help is great. thanks! Identify the type of observational study as either Cross-sectional or retrospective (just a reminder, Cross-sectional is data measured at one point in time, retrospective is data collected from...
Monday, January 21, 2013 at 9:02pm

Statistics
does some one mind checking my work? it's real simple Stats vocab. thank you! Determine whether the given description corresponds to an observational study or an experiment: (just as a refresher, observational means passive and experiment means active) 1.)much contoversy ...
Monday, January 21, 2013 at 8:54pm

statistics
Using the central limit theorem, construct a 95% confidence interval for the average total cry time for infants in the control group and infants in the intervention group. For this question only, assume that the standard deviation of cry time within each group is known and is ...
Monday, January 21, 2013 at 12:53am

statistics help please!
Twelve college students were surveyed about the distance from their house to the college they attended. 12 18 54 13 15 24 8 5 14 27 1 20 1. Using the data set above, find the percentile ranking for the data point 24. (is this 75th percentile? 2. Using the data set above, what ...
Sunday, January 20, 2013 at 2:55pm

Statistics
3 balls are drawn successively from a box containing 6red,4 white and 5 blue balls.Find the probability that they are drawn in order red,white and blue if:(a)each ball is replaced.(b)balls are not replaced
Sunday, January 20, 2013 at 5:06am

statistics
In a local marathon, Bob finished 60th out of 400 participants. What is his percentile ranking for this race?
Saturday, January 19, 2013 at 9:36pm

statistics
A company is trying to show that their wages are fair. The mean salary is $45,000 but the median is $67,000. Which should they use for their position?
Saturday, January 19, 2013 at 9:35pm

statistics
Twelve college students were surveyed about the distance from their house to the college they attended. 12 18 54 13 15 24 8 5 14 27 1 20 1. Using the data set above, find the percentile ranking for the data point 24. 2. Using the data set above, what distance corresponds to ...
Saturday, January 19, 2013 at 9:34pm

statistics
In a competitive application process, two applicants were closely matched and the judges needed to compare their percentile ranking to see who should be offered the last position.Jeremiah ranked 405th in a class of 1,200 and Joshua ranked 12th in a class of 89. Based solely on...
Saturday, January 19, 2013 at 9:32pm

statistics
Using the fitted regression model, estimate the average change in cry time for infants with severe pain versus those without severe pain, holding group constant. Provide a 95% confidence interval for this estimate. My question: What holding group constant means?
Saturday, January 19, 2013 at 4:50pm

Statistics
Can you get the mean, median, and mode from a list of credit card names?
Saturday, January 19, 2013 at 12:07pm

Statistics!
Many companies "grade on a bell curve" to compare the performance of their managers and professional workers. This forces the use of some low performance ratings so that not all workers are listed as "above average." Ford Motor Company’s "...
Friday, January 18, 2013 at 4:44pm

Statistics
Eight sprinters from different universities are in the final match. In how many ways can the sprinters receive a gold, a silver, or a bronze medal?
Friday, January 18, 2013 at 8:29am

Statistics
A committee will elect a president, a secretary, and a treasurer. If the committee consists of 35 members, how many possible outcomes for the three positions can occur? (Note that no member can be elected in two positions.)
Friday, January 18, 2013 at 8:27am

statistics
help me work out the problem to calculate the difference means distribution parameters n(1)=25, n(2)=36 s(1)square=50, s(2) square=72, M(1)=100,M(2)=105
Friday, January 18, 2013 at 12:20am

statistics
There are two independent groups of students one group took online courses the second group took conventional course face-face. Using the sample data determine if there is a significant difference between the 2 groups scores.Ho(mu1-mu2)=0 (no difference), H1(mu1-mu2)<>0...
Thursday, January 17, 2013 at 7:03pm

Statistics
Suppose you were in charge of advertising for an automotive dealership when the gas prices increased to $4 per gallon. Most of your cars are fuel-efficient, but you have two models that have extremely poor fuel economy, that is, a low number of miles per gallon. How would you ...
Wednesday, January 16, 2013 at 10:31pm

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