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February 1, 2015

February 1, 2015

**Recent Homework Questions About Statistics**

Post a New Question | Current Questions

**Statistics - Help!**

I really really need help with this. Can someone please look at it and let me know. At 100 college campuses, 1200 full-time undergraduate students were surveyed on their credit card usage. Among juniors, 65% reported that they didn't have a credit card in their own name, ...
*Sunday, July 7, 2013 at 9:33pm*

**Statistics**

Examples please!Create a drawing or plan for a 2 x 3 experimental design that would lend itself to a factorial ANOVA. Be sure to identify the independent and dependent variables.
*Sunday, July 7, 2013 at 8:17pm*

**Statistics**

An analysis of variance was used to evaluate the mean differences from a repeated-measures research study. The results were reported as F(3,24)=6.40. a. How many treatment conditions were compared in the study? b. How many individuals participated in the study?
*Sunday, July 7, 2013 at 8:16pm*

**Statistics**

A researcher reports an F-ratio with df= 2, 12 for a repeated measures of ANOVA. a. How many treatment conditions were compared in the study? b. How many individuals participated in the study?
*Sunday, July 7, 2013 at 8:16pm*

**statistics**

A researcher reports an F-ratio with df= 2, 12 for a repeated measures of ANOVA. How many treatment conditions were compared in the study?
*Sunday, July 7, 2013 at 7:16pm*

**Statistics**

At 100 college campuses, 1200 full-time undergraduate students were surveyed on their credit card usage. Among juniors, 65% reported that they didn't have a credit card in their own name, and 23% reported that they had at least one credit card in their own name and they ...
*Sunday, July 7, 2013 at 3:13pm*

**Statistics/Probability**

3. On a given evening, two roommates, roommate A and roommate B, are arguing over who should control the television remote. Roommate A suggests a game of rock-paper-scissors to settle the dispute. It's the first time that the roommates have played each other in rock-paper-...
*Sunday, July 7, 2013 at 12:15pm*

**Statistics/Probability**

2. Two roommates, roommate X and roommate Y, are expecting company and are arguing over who should have to wash the dishes before the company arrives. Roommate X suggests a game of rock-paper-scissors to settle the dispute. Consider the game of rock-paper-scissors to be a ...
*Sunday, July 7, 2013 at 12:00pm*

**Statistics/Probability**

1. Two roommates, roommate A and roommate B, are about to go cruising with a mutual friend and are arguing over who gets to sit in the front seat. Roommate A suggests a game of rock-paper-scissors to settle the dispute. Consider the game of rock-paper-scissor to be a ...
*Sunday, July 7, 2013 at 11:34am*

**statistics**

According to the local real estate board, the average number of days that homes stay on the market before selling is 78.4 with a standard deviation equal to 11 days. A prospective seller selected a random sample of 36 homes from the multiple listing service. Above what value ...
*Saturday, July 6, 2013 at 1:39pm*

**statistics**

If I know that a set of test scores has a mean of 75 and a standard deviation of 8 what can I conclude?
*Friday, July 5, 2013 at 8:47pm*

**Statistics**

A district mathematics test for all third graders had a normal distribution with a mean of 74 and a standard deviation of 11. What percentage of the third graders tested scored with +1 and -1 standard deviation of the mean?
*Friday, July 5, 2013 at 2:12pm*

**statistics **

1. Are there more broken bones in summer or winter? We get records about the number of fractures treated in January and July at a random sample of 25 emergency rooms. The 95% confidence interval for the mean change ( μd = μJan - μJuly )in the numbers of ...
*Thursday, July 4, 2013 at 3:54pm*

**Statistics**

The distribution of heights of adult American men is approximately normal with a mean of 68 inches and a standard deviation of 2 inches. What percent of mean are at least 72 inches tall?
*Thursday, July 4, 2013 at 3:02pm*

**statistics **

The makers of the MAGNETIZER Engine Energizer System (EES) claim that it improves gas mileage and reduces emissions in automobiles by using magnetic free energy to increase the amount of oxygen in the fuel for greater combustion efficiency. Following are test results, ...
*Thursday, July 4, 2013 at 1:07pm*

**statistics**

population with a mean of 110 and a standard deviation of 6, what is the likelihood of a score of 100 or lower
*Thursday, July 4, 2013 at 12:31am*

**statistics**

There is a table of AVERAGE monthly temperatures of two different areas of the same city. A scatterplot of the data is made to show that the relationship is linear between the two. If raw data was used instead of the averages to make the scatterplot, the correlation ...
*Wednesday, July 3, 2013 at 10:36pm*

**statistics **

A new medication has been created to treat osteo-arthritis inflammation and pain. Doctors prescribing the drug claim that the drug is not as effective for women as men since women taking the medication have higher pain levels than men. The pharmaceutical company conducts a ...
*Wednesday, July 3, 2013 at 11:55am*

**graduate statistics**

Does computer-assisted instruction help community college health students with reading difficulties to learn reading skills at a faster than normal rate? A researcher arranged for one of these students to have access to a set of computer-learning programs instead of the normal...
*Wednesday, July 3, 2013 at 10:18am*

**graduate statistics**

Do children from lower socioeconomic status (SES) neighborhoods have lower than average test-taking skills? A researcher administered a standard measure of test-taking skills to a randomly chosen child from a low SES neighborhood and found him to have a score of 38. The ...
*Wednesday, July 3, 2013 at 10:17am*

**graduate statistics**

A nursing professor was curious as to whether the students in a very large class she was teaching who turned in their tests first scored differently from the overall mean on the test. The overall mean score on the test was 75 with a standard deviation of 10; the scores were ...
*Wednesday, July 3, 2013 at 10:17am*

**Statistics**

A test is made of H0: mean = 27 versus H1: mean < 27. The true value of the mean is 27, and H0 is rejected. Is this a Type I error, Type II error, or a correct decision? How do I determine which is which??? Question 4 options: 1) Type II error 2) Type I error 3) Correct ...
*Tuesday, July 2, 2013 at 7:30pm*

**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 (...
*Tuesday, July 2, 2013 at 6:19pm*

**Statistics **

Two dice are tossed. What is the probability that the sum of both dice is a prime number? This is what I have so far Presuming two fair, 6-sided dice, each numbered 1 through 6: You can achieve one of the following results on any given roll: 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12...
*Tuesday, July 2, 2013 at 4:31pm*

**statistics**

population mean of 110 and SD of 6, what is likelihood of having score of 100 0r lower
*Tuesday, July 2, 2013 at 1:55pm*

**Statistics**

In a recent year, Delaware had the highest per capita annual income with $51,803. If o=$4850, find the mean X that falls at the 95th percentile for a sample of 35 residents.
*Tuesday, July 2, 2013 at 10:25am*

**statistics**

how to caculate using a ruler to measure the thickness of a 25 pages in a textbook
*Tuesday, July 2, 2013 at 1:04am*

**statistics**

how to caculate using a ruler to measure the thickness of a 25 pages in a textbook
*Tuesday, July 2, 2013 at 1:04am*

**Statistics**

A company has developed a new type of light bulb, and wants to estimate its mean lifetime. A simple random sample of 12 bulbs had a sample mean lifetime of 692 hours with a sample standard deviation of 30 hours. It is reasonable to believe that the population is approximately ...
*Monday, July 1, 2013 at 7:01pm*

**Statistics**

What critical value for z would be used to test the hypotheses: H0:μ≤10 and Ha:μ>10, for α = 0.05 ?
*Monday, July 1, 2013 at 3:06pm*

**statistics**

A senator asks his constituents to rank seven issues in order of importance. How many rankings are possible?
*Monday, July 1, 2013 at 12:28pm*

**statistics**

Assuming SAT score data are normally distributed, if only the top 25% of students based on SAT scores qualify to be interviewed for a particular school what would be the minimum score required to have to be interviewed if the population mean is a 1509 and the standard ...
*Monday, July 1, 2013 at 7:01am*

**Statistics**

A department store is running a promo one Saturday by giving out coupons for $10 of free merchandise. However, one-third of customers spend $40, and one-third spend$75. The remainder of customers who come in the store do not take advantage of the promo at all. A) find expected...
*Sunday, June 30, 2013 at 11:26pm*

**Business Statistics**

Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size 3. From each telephone number identified as a source, take the fourth, fifth, and sixth digits.
*Sunday, June 30, 2013 at 7:58pm*

**Statistics**

you are going to test the claim that more than 60% of men refuse to ask for directions when lost. if you use a significance level of .10, what will the critical number be for your rejection region?
*Sunday, June 30, 2013 at 5:53pm*

**psych statistics**

Martha believes that a relaxation technique involving visualization will help people with mild insomnia fall asleep faster. She randomly selects a sample of 20 participants from a group of mild insomnia patients and randomly assigns 10 to receive visualization therapy. The ...
*Sunday, June 30, 2013 at 5:15pm*

**college algebra: probability and statistics**

You roll a single die once. What is the probability you will roll an odd number or an even number?
*Sunday, June 30, 2013 at 3:58pm*

**Statistics**

Many times, we are required to use statistical measures to try and construct a problem. We run a program for a 10 different inputs. The times are measures in 1-second intervals and none of them took 0 secs. a. Suppose the standard deviation of a set of times we run the program...
*Sunday, June 30, 2013 at 2:51pm*

**Statistics**

There is a mathematical theory called queuing theory that studies ways in which computer jobs are fed in CPUs and researches on how these can be reduced to a minimum. Show how can a computer estimate the average number of jobs waiting at a queue? Suppose that in a 5 sec ...
*Sunday, June 30, 2013 at 2:46pm*

**Statistics**

Can anyone tell me how to use TI-84 calculator to solve this problem??? A company has developed a new type of light bulb, and wants to estimate its mean lifetime. A simple random sample of 12 bulbs had a sample mean lifetime of 692 hours with a sample standard deviation of 30 ...
*Saturday, June 29, 2013 at 11:02pm*

**Statistics**

Use the following table to answer the questions. (Give your answers correct to two decimal places.) x 1 1 3 3 5 5 7 7 9 9 y 3 2 6 1 3 3 3 2 5 3 (a) Find the equation of the line of best fit. y hat = 2.6+.1x (b) Find the ordinates y hat for the points on the line of best fit ...
*Saturday, June 29, 2013 at 8:32pm*

**statistics**

a random sample from the population of registered voters in california is to be taken and then surveyed about an upcoming election. What sample size should be used to guarantee a sampling error of 3% or less when estimating p at the 95% confidence level? is this the answer......
*Saturday, June 29, 2013 at 6:21pm*

**statistics**

The population (in millions) and the violent crime rate (per 1000) were recorded for 10 metropolitan areas. The data are shown in the following table. Do these data provide evidence to reject the null hypothesis that ƒÏ = 0 in favor of ƒÏ ‚ 0 at...
*Saturday, June 29, 2013 at 5:46pm*

**Statistics**

The arena has a policy of selling as many as 16 tickets for a show for which there are only 15 seats available. The manager has noticed in the past that only 88% of people who purchase a ticket annually come for the show. Find the probability that if 16 tickets are sold, not ...
*Saturday, June 29, 2013 at 3:33pm*

**statistics**

assume you have a data set from a normally distributed random variable. answer the following: will the random variable be discrete, continuous, or neither? How do you know? I believe its continuous but cant explain why will the data be qualitative or quantitative? How do you ...
*Saturday, June 29, 2013 at 1:56pm*

**statistics**

comment on this statement "The mean loss for customers at the first State bank (which is not insured) was $150.00 the standard deviation of the losses was -$125.00"
*Friday, June 28, 2013 at 12:22pm*

**statistics **

Randomly selected cans of Coke are measured for the amount of cola in ounces. The sample values listed below have a mean of 12.18 ounces and a standard deviation of 0.118 ounces. Use DataDesk to find a 99% confidence interval for the mean volume of Coke in cans. Show the upper...
*Friday, June 28, 2013 at 12:03pm*

**Statistics.**

A person apply for a job in two firms say X&Y, the probability of his been selected in firm X is 0.7, and been rejected in firm Y is 0.5. The probability of atleast 1 of his application been rejected is 0.6. What is the probability he will be selected in one of the two firms.
*Friday, June 28, 2013 at 3:30am*

**statistics**

n youth corp have to stand in a row if all possible permutations;are equally likely. Fine the probability that 2 particular corp members stand side by side.
*Friday, June 28, 2013 at 3:16am*

**statistics **

Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women favor stricter gun laws. A recent telephone survey of 1026 adults by IBR Polls found that 65.9% of ...
*Thursday, June 27, 2013 at 7:25pm*

**statistics **

Which of the following criteria must be met to do a one-sample test for a proportion? A. The data values in the sample must be independent. B. The parent population must be normally distributed. C. The data must come from a random sample. D. The sample size must be more than ...
*Thursday, June 27, 2013 at 6:34pm*

**Statistics **

Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women favor stricter gun laws. A recent telephone survey of 1026 adult women by IBR Polls found that 65.9...
*Thursday, June 27, 2013 at 5:55pm*

**Statistics **

Politicians are interested in knowing the opinions of their constituents on important issues. One administrative assistant to a senator claims that more than 63% of adult women favor stricter gun laws. A recent telephone survey of 1026 adults by IBR Polls found that 65.9% of ...
*Thursday, June 27, 2013 at 5:52pm*

**statistics & probability**

according to a survey, 30% of 18-25 year olds have blue eyes. In a random sample of 8 people in this age group what is the probability that exactly 0 have blue eyes?
*Thursday, June 27, 2013 at 2:03am*

**Statistics**

If 1000 raffle tickets were sold for a TV prize that is worth $275 and a ticket number is drawn to determine the winner, what is the expected value of the raffle?
*Thursday, June 27, 2013 at 12:09am*

**Statistics Help**

Consider the following ANOVA experiments. (Give your answers correct to two decimal places.) (b) Determine the critical region and critical value that are used in the classical approach for testing the null hypothesis Ho: ì1 = ì2 = ì3 = ì4 = ì...
*Wednesday, June 26, 2013 at 8:49pm*

**Statistics**

A simple random sample of 10 households, the number of TV's that each household had is as follows: 1, 3, 1, 2, 0, 2, 1, 1, 1, 5 Assume that it is reasonable to believe that the population is approximately normal and the population standard deviation is 0.56. What is the ...
*Wednesday, June 26, 2013 at 2:25pm*

**statistics**

2. The manager of a sandwich shop gathers data on what people spend on lunch on a particular day of the week. The results are $4.20, $4.22, $2.35, $4.32, $5.25, $6.48, $6.78, $8.59, $6.95, $5.52, $6.83, $7.35, $4.36, $9.39, $6.42. To the degree that this represents the ...
*Wednesday, June 26, 2013 at 1:52pm*

**Statistics**

A college admissions officer takes a simple random sample of 103 entering freshmen and computes their mean mathematics SAT score to be 493. Assume the population standard deviation is 112. What is the lower bound of the 99% confidence interval? Round your answer to the nearest...
*Wednesday, June 26, 2013 at 9:30am*

**statistics**

A study was conducted in order to estimate μ, the mean number of weekly hours that U.S. adults use computers at home. Suppose a random sample of 81 U.S. adults gives a mean weekly computer usage time of 8.5 hours and that from prior studies, the population standard ...
*Wednesday, June 26, 2013 at 5:10am*

**statistics**

A study was conducted in order to estimate μ, the mean number of weekly hours that U.S. adults use computers at home. Suppose a random sample of 81 U.S. adults gives a mean weekly computer usage time of 8.5 hours and that from prior studies, the population standard ...
*Wednesday, June 26, 2013 at 4:16am*

**statistics**

A study was conducted in order to estimate μ, the mean number of weekly hours that U.S. adults use computers at home. Suppose a random sample of 81 U.S. adults gives a mean weekly computer usage time of 8.5 hours and that from prior studies, the population standard ...
*Wednesday, June 26, 2013 at 4:15am*

**statistics**

A study was conducted in order to estimate μ, the mean number of weekly hours that U.S. adults use computers at home. Suppose a random sample of 81 U.S. adults gives a mean weekly computer usage time of 8.5 hours and that from prior studies, the population standard ...
*Wednesday, June 26, 2013 at 4:09am*

**Statistics check**

Complete the hypothesis test with alternative hypothesis ƒÊd ‚ 0 based on the paired data that follows and d = O - Y. Use ƒ¿ = 0.01. Assume normality. Oldest 188 174 192 196 65 Youngest 186 168 199 199 69 (a) Find t. (Give your answer correct ...
*Tuesday, June 25, 2013 at 8:00pm*

**statistics**

Consider the following ANOVA experiments. (Give your answers correct to two decimal places.) (a) Determine the critical region and critical value that are used in the classical approach for testing the null hypothesis Ho: ì1 = ì2 = ì3 = ì4 = ì...
*Tuesday, June 25, 2013 at 7:54pm*

**Statistics**

Find the value of z that would be used to test the difference between the proportions, given the following. (Use G - H. Give your answer correct to two decimal places.) Sample n x G 386 327 H 414 321
*Tuesday, June 25, 2013 at 7:52pm*

**statistics**

The mean loss for customers at the first State bank (which is not insured) was $150.00 the standard deviation of the losses was -$125.00
*Tuesday, June 25, 2013 at 5:08pm*

**statistics**

the mean loss for customers at first state bank (which was not insured) was $150. The standard deviation of the losses was -$125
*Tuesday, June 25, 2013 at 3:21pm*

**statistics**

According to Advertising Age, the average base salary for women working as copywriters is $66,000. Assume that the salaries are normally distributed and that the standard deviation is $7,500. a. What is the probability of a woman receiving a salary between $60,000 and $75,000...
*Tuesday, June 25, 2013 at 12:31pm*

**statistics**

The Stop N’ Go convenience chain recently selected a random sample of 10 customers. The store monitored the number of times each customer made a purchase at the store over a two-month period. The following data were collected:
*Tuesday, June 25, 2013 at 12:21pm*

**statistics help**

Complete the hypothesis test with alternative hypothesis ƒÊd ‚ 0 based on the paired data that follows and d = O - Y. Use ƒ¿ = 0.01. Assume normality. Oldest 188 174 192 196 65 Youngest 186 168 199 199 69 (a) Find t. (Give your answer correct ...
*Monday, June 24, 2013 at 10:28pm*

**statistics**

Could someone work a problem like this one, for an example. Complete the hypothesis test with alternative hypothesis ìd < 0 based on the paired data that follow and d = M - N. Use á = 0.02. Assume normality. M 49 67 45 57 57 48 N 57 68 47 60 64 55 (a) Find t...
*Monday, June 24, 2013 at 5:39pm*

**statistics**

6. According to the records of Enersource, an electric company serving the Mississauga area, the mean electricity consumption for all households during winter is 1650 kilowatt-hours per month. Assume that the monthly electricity consumption during winter by all households in ...
*Sunday, June 23, 2013 at 9:51pm*

**statistics**

The pucks used by the National Hockey League for ice hockey must weigh between 5.5 and 6.0 ounces. Suppose the weights of pucks produced at a factory are normally distributed with a mean of 5.75 ounces and a standard deviation of 0.11 ounce. What percentage of the pucks ...
*Sunday, June 23, 2013 at 9:51pm*

**statistics**

Page 1 of 2 4. Despite all efforts by the quality control department, the fabric made at Benton Corporation always contains a few defects. A certain type of fabric made at this corporation contains an average of .5 defects per 500 yards. Using the Poisson formula, find the ...
*Sunday, June 23, 2013 at 9:51pm*

**statistics**

3. Magnetic resonance imaging (MRI) is a process that produces internal body images using a strong magnetic field. Some patients become claustrophobic and require sedation because they are required to lie within a small, enclosed space during the MRI test. Suppose 29% of all ...
*Sunday, June 23, 2013 at 9:50pm*

**statistics**

2. Bender electronics buys keyboards for its computers from another company. The keyboards are received in shipments of 100 boxes, each box containing 20 keyboards. The quality control department at Bender Electronics first randomly selects one box from each shipment and then ...
*Sunday, June 23, 2013 at 9:50pm*

**Statistics**

1. Let x be the number of heads obtained in two tosses of a coin. The following table lists the probability distribution of x. x 0 1 2 P(x) .25 .50 .25 Calculate the mean and standard deviation of x. Give a brief interpretation of the value of the mean.
*Sunday, June 23, 2013 at 9:49pm*

**statistics check**

The computer-science aptitude score, x, and the achievement score, y (measured by a comprehensive final), were measured for 10 students in a beginning computer-science course. The results were as follows. (Give your answers correct to two decimal places.) x 7 10 19 9 20 22 6 ...
*Sunday, June 23, 2013 at 8:41pm*

**statistics check**

Consider the following bivariate data. Point A B C D E F G H I J x 3 4 2 1 7 2 1 0 4 2 y 1 7 3 3 6 6 5 0 6 2 (b) Calculate the covariance. (Give your answer correct to two decimal places.) 5.35 was my answer . (c) Calculate sx and sy. (Give your answers correct to three ...
*Sunday, June 23, 2013 at 7:45pm*

**statistics**

According to the Journal of the American Medical Association, the doctors found that in the week before and the week after Thanksgiving, there were 12,000 total deaths and 6062 of them occurred in the week before Thanksgiving. Construct a 95% confidence interval of the ...
*Sunday, June 23, 2013 at 5:01pm*

**statistics**

The National Highway Traffic Safety Administration analyzes the crash test data for new cars. One variable measured is the severity of the injury due to a collision. The higher the severity, the higher the points assigned. Assume that the injury rating is normally distributed ...
*Sunday, June 23, 2013 at 5:00pm*

**Statistics**

According to the American Automobile Association (AAA), the mean cost of a gallon of regular unleaded fuel in 2007 was $2.835. AAA noted that the standard deviation of the fuel price was $0.15. A random sample of n=100 gas stations is selected and the mean gas price is ...
*Sunday, June 23, 2013 at 5:00pm*

**statistics **

Consider the following ANOVA experiments. (Give your answers correct to two decimal places.) (a) Determine the critical region and critical value that are used in the classical approach for testing the null hypothesis Ho: ì1 = ì2 = ì3 = ì4, with n...
*Sunday, June 23, 2013 at 2:08pm*

**statistics**

the probability that a football game will go into overtime is 17%. In 240 randomly selected football games, what is the mean and the standard deviation of the number that went into overtime
*Sunday, June 23, 2013 at 9:00am*

**statistics**

Consider the following table and use the formulas that are given for computing the correlation coefficient. (Give your answer correct to two decimal places.) x 1 1 0 0 0 y 7 3 5 6 6 r = n xy − x y n x2 − x 2 n y2 − y 2 (1) r = SS(xy) SS(x) · SS(y) (2) ...
*Sunday, June 23, 2013 at 12:06am*

**statistics**

Consider the following set of data. (18, 12), (29, 48), (65, 29), (82, 24), (115, 56), (124, 13) (a) Calculate the covariance of the set of data. (Give your answer correct to two decimal places.) . (b) Calculate the standard deviation of the six x-values and the standard ...
*Sunday, June 23, 2013 at 12:04am*

**statistics**

Consider the following bivariate data. Point A B C D E F G H I J x 3 4 2 1 7 2 1 0 4 2 y 1 7 3 3 6 6 5 0 6 2 (b) Calculate the covariance. (Give your answer correct to two decimal places.) (c) Calculate sx and sy. (Give your answers correct to three decimal places.) sx = sy...
*Sunday, June 23, 2013 at 12:03am*

**statistics**

The customer bills in a family restaurant are normally distributed. The bills mean is $28 and has a standard deviation of $6. a. Identify what the random variable you are measuring is in this problem. b. What is the probability that a randomly selected bill will be at least $...
*Saturday, June 22, 2013 at 2:15pm*

**statistics**

What is your conclusion based on the following data? A survey was conducted to study the effects of weight loss from a low fat diet. Two random samples of 100 people each were selected. One group was put on the low fat diet and the other group on the regular diet. The weight ...
*Saturday, June 22, 2013 at 1:21pm*

**statistics**

Set up the null and alternative hypothesis for the following problem. A survey reported the planning habits of men and women. The question asked, "how do you primarily keep track of meetings, appointments and deadlines?" 56% of men and 46% of women answered, "in...
*Saturday, June 22, 2013 at 1:19pm*

**statistics**

Calculate p ̅. x1 20 n1 50 x2 55 n2 100
*Saturday, June 22, 2013 at 1:18pm*

**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 ...
*Saturday, June 22, 2013 at 1:17pm*

**statistics**

How is the P-value used to determine whether or not to reject the null hypothesis?
*Saturday, June 22, 2013 at 1:17pm*

**Statistics**

There were two independent groups who took a school course by different modes. The first sample of students took the course in the online and the second sample took the course in the conventional face to face mode. Using the sample data determine if there is significant ...
*Saturday, June 22, 2013 at 4:41am*

**statistics**

If a teacher wants to test her belief that more than 5 students in college classes typically receive A as a grade, she'll perform? a. two tailed testing of a mean b. two tail testing of a proportion c. one tail testing of a proportion d. one tail testing of a mean I choose...
*Friday, June 21, 2013 at 6:03pm*

**statistics**

A normal distribution has a standard deviation equal to 23. What is the mean of this normal distribution if the probability of scoring above x = 181? record to 1 decimal place
*Friday, June 21, 2013 at 1:14am*

**Statistics**

A survey among freshmen at a certain university revealed that the number of hours spent studying the week before final exams was normally distributed with mean 25 and standard deviation 15. A sample of 36 students was selected. What is the probability that the average time ...
*Thursday, June 20, 2013 at 5:36pm*

**Statistics**

The mean monthly rent for a one-bedroom apartment without a doorman in Manhattan is $2,636. Assume the standard deviation is $500. A real estate firm samples 100 apartments. What is the probability that the average rent of the sample is more than $2,680?
*Thursday, June 20, 2013 at 5:36pm*

**Statistics**

Suppose that a sample of size 58 is drawn from a population with mean 23 and standard deviation 80. Find the value of , the mean of the distribution of sample means. Wrtie only a number as your answer.
*Thursday, June 20, 2013 at 2:19pm*

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