The Gibbs Baby Food Company wishes to compare the weight gain of infants using their brand versus their competitor's. A sample of 40 babies using the Gibbs products revealed a mean weight gain of 7.6 pounds in the first three months after birth. The standard deviation of the sample was 2.3 pounds. A sample of 55 babies using the
Mary Jo Fitzpatrick is the Vice President for Nursing Services at St. Luke's Memorial Hospital. Recently she noticed in the job postings for nurses that those that are unionized seem to offer higher wages. She decided to investigate and gathered the following sample information. Group Mean Wage Sample Standard Deviation
A financial analyst wants to compare the turnover rates, in percent, for shares of oil-related stocks versus other stocks, such as GE and IBM. She selected 32 oil-related stocks and 49 other stocks. The mean turnover rate of oil-related stocks is 31.4 percent and the standard deviation 5.1 percent. For the other stocks, the mean
As part of a study of corporate employees, the Director of Human Resources for PNC, Inc. wants to compare the distance traveled to work by employees at their office in downtown Cincinnati with the distance for those in downtown Pittsburgh. A sample of 35 Cincinnati employees showed they travel a mean of 370 miles per month, with
Past records suggest that the mean annual income, , of teachers in state of Arizona is greater than or equal to the mean annual income, , of teachers in Nevada. In a current study, a random sample of teachers from Arizona and an independent random sample of teachers from Nevada have been asked to report their mean annual inc
Arbitron Media Research Inc, conducted a study of the radio listening habits of men and women. One facet of the study involved the mean listening time. It was discovered that the mean listening time for men was 35 minutes per day. The standard deviation of the sample was 10 men studied was 10 minutes per day. The mean listening
(Statistical Techniques in Business & Economics, 11th ed.) Lind et al. Nonparametric statistical measures: a. compare population means or proportions to determine the relationship between variables. b. Can only be used with independent samples c. Allow for testing procedures that eliminate some of the unrealistic assumptions r
To test if mean utilization of citrus fruits by US people is at least 64%. See attached file for full problem description. Chpt#7 1) A citrus grower' s association believes that the mean utilization of fresh citrus fruits by people in US is a least 94 pounds per year. A ramdon sa
A pesticide company wanted to test the formulation of a new pest control chemical with respect to its effectiveness in killing roaches. The existing pesticide had an effectiveness rate of 70%. The existing chemical will be replaced if it can be proved that the new chemical is more effective. To test the new chemical, they tes
Last year's mean hourly wage (in dollars) for all hospital clerical workers in a large state was See attached file for full problem description. An administrator for the state believes that this year's mean hourly wage for hospital clerical workers is greater than last year's mean. She hires statisticians to sample a number
The mean rate of return on portfolio A (12 stocks) was calculated to be 11% with a standard deviation of 3.4%; the mean rate of return on portfolio b (10 stocks) was determined to be 12.8% with a standard deviation of 4%. At the .05 significance level,: a. F = 3.02, we can conclude that there is more variation in portfolio
At the time he was hired as a server at the Family Restaurant, Bob was told, "You can average more than $20 a day in tips." Over the first 36 days he was employed at the restaurant, the mean daily amount of his tips was $24.85 with a standard deviation of $3.24. With a 1% (or .01) Level of Significance, can Bob conclude that he
See the attachment. Advertisements claims that learning a technique will improve the test scores for students The scores of the ten randomly selected students are recorded before and after the technique. For each randomly selected sample, assume the distribution of the population is norma,=l. At a=0.10 is there enough ev
Basically trying to figure out once you get the test statistics how you determine critical value through the Table chart. Trying to find critical value for test statistics of 2.36 with 10 subjects, 7 had higher scores, 2 had lower scores, and 1 score did not change. Using the traditional method of hypothesis testing. Use a
Details: Piggybank has narrowed its options down to two incentive plans: A. cash back when the consumer makes an online purchase; and B. cash back when the consumer makes a purchase at a clothing store. the bank doesn't know whether consumers would shop online more than at clothing stores. Information experts has placed you
A department store accepts three types of credit cards: MC, Visa and their own. The sales management is interested in finding out whether there is a difference in the mean amounts charged by the customers on the 3 cards. A random sample of 18 credit card purchases (rounded) revealed the following amounts. At the 0.05 signific
1. The rates of growth of Bardeen Chemicals for the past five years are 5.2 percent, 8.7 percent, 3.9 percent, 6.8 percent, and 19.5 percent. What is the arithmetic mean annual growth rate? What is the geometric mean annual growth rate? Should the arithmetic mean or geometric mean be used to represent the average annual gro
A-State the decision rule b-compute the pooled estimate of the population varaince c-compute the test statistic d-state your decision about the null hypothesis e-estimate the p-value A random sample of 10 observations from one population revealed a sample mean of 23 and a sample deviation of 4. A random sample of 8 obser
The manufacturer of the X-15 steel-belted radial truck tire claims that the mean mileage the tire can be driven before the tread wears out is 60,000 miles. The standard deviation of the mileage is 5,000 miles. The Crosset Truck Company bought 48 tires and found that the mean mileage for their trucks is59,500 miles. Is Crosset's
For your study on the eating habits of teenage males, you randomly select 20 teenage males ans ask each how many 12-ounces serving of soda he drinks every day. At a=0.05, is there enough evidence to support the claim that teenage males drink more than three 12-ounce serving of soda per day?(assume the population is normally dist
In a particular market there are three commercial television stations, each with its own evening news program from 6:00 to 6:30 P.M. According to a report in this morning's local newspaper, a random sample of 150 viewers last night revealed 53 watched the news on WNAE (channel 5), 64 watched on WRRN (channel 11), and 33 on WSPD
The chief of security for the Mall of the Dakotas was directed to study the problem of missing goods. He selected a sample of 100 boxes that had been tampered with and ascertained that for 60 of the boxes, the missing pants, shoes, and so on were attributed to shoplifting. For 30 other boxes employees had stolen the goods, and f
Given the following sample information, test the hypothesis that the treatment means are equal at the .05 significance level. (Check the attached file for table) a. State the null hypothesis and the alternate hypothesis. b. What is the decision rule? c. Compute SST, SSE, and SS total. d. Complete an ANOVA table. e. State
5. The manufacturer of the X-15 steel-belted radial truck tire claims that the mean mileage the tire can be driven before the tread wears out is 60,000 miles. The standard deviation of the mileage is 5,000 miles. The Crosset Truck Company bought 48 tires and found that the mean mileage for their trucks is59,500 miles. Is Crosset
Determine the decision criterion for rejecting the null hypothesis in the given hypothesis test; i.e., describe the values of the test statistic that would result in rejection of the null hypothesis. Suppose you wish to test the claim that ?d, the mean value of the differences d for a population of paired data, is greater t
The county commissioners received a number of complaints from county residents that the Roxborough Fire Department takes longer to respond to firs than the Manayunk Fire Department. To check the validity of these claims, a random sample of 60 fires handled by the Roxborough Fire Department was selected. It was found that the m
Last year the records of Ski and Golf, Inc., a sporting goods chain, showed the mean amount spent by a customer was $30. A sample of 40 transactions this month revealed the mean amount spent was $33, with a standard deviation of $12. At the 0.05 significance level can we conclude that the mean amount spent has increased?
The manufaturer of the new subcompact Clipper claims that it will average "40 or more miles per gallon on the open road". Some of the competitors believe this claim is too high. To investigate, an independent testing agency is hired to conduct hightway mileage tests. A random sample of 64 clippers showed their mean miles per
Fairfield Homes is developing two parcels near Pigeon Fork, Tennessee. In order to test different advertising approaches, they use different media to reach potential buyers. The mean annual family income for 75 people making inquiries at the first development is $150,000, with a standard deviation of $40,000. A corresponding sam