1. The statement that the probability of a Type I error is 0.05 means 1) alpha = 0.05 2) The probability that we are wrong in our decision of rejecting the null hypothesis is 5%. 3) All of the above 4) We decide to reject the null hypothesis at the 0.05 level of significance. 2. A gambler has developed two strateg
1. Each year a nationally recognized publication conducts its "Survey of America's Best Graduate and Professional Schools." An academic advisor wants to predict the typical starting salary of a graduate at a top business school using GMAT score of the school as a predictor variable. A simple linear regression of SALARY vers
1. Do motivation levels between Japanese and American managers differ? A randomly selected group of each were administered the Sarnoff Survey of Attitudes Toward Life (SSATL), which measures motivation for upward mobility. The SSATL scores are summarized below: Judging from the way the data were collected, which experimental
1. A national organization has been working with utilities throughout the nation to find sites for large wind machines for generating electric power. Wind speeds must average more than 12 miles per hour (mph) for a site to be acceptable. Recently, the organization conducted tests at a particular site under consideration for a w
Test the hypothesis that the standard deviation is 10 (use the data below). Provide a 95% confidence interval for the variance. Compute the p value for the test. 101.633 91.169 108.907 102.19 99.485 96.078 112.841 109.448 106.771 90.432 110.971 105.659 100.346 94.768 77.861 86.412 96.465 89.31 90.101 123.1
1. The basic assumption in linear regression is that the relationship between variables can be approximated by linear relation. Can you think of examples of such relations that you expect to be linear relations? 2. Pick one of the feature hypothesis tests and explain it in everyday language. 3. Consider rolling a pair of d
The Asian economy faltered during the last few months of 1997. Investors anticipated that the downturn in the Asian economy would have a negative effect on the earnings of companies in the United States during the fourth quarter of 1997. The following sample data show the earnings per share for the fourth quarter of 1996 and the
Two boats, the Prada (Italy) and the Oracle (U.S.A.), are competing for a spot in the upcoming America's Cup race. They race over a part of the course several times. Below are the sample times in minutes. At the .05 significance level, can we conclude that there is a difference in their mean times? Boat Times (minutes) Prad
Clark Heter is an industrial engineer at Lyons Products. He would like to determine whether there are more units produced on the afternoon shift than on the day shift. A sample of 54 day-shift workers showed that the mean number of units produced was 345, with a standard deviation of 21. A sample of 60 afternoon-shift workers s
See attached file for full problem description. In a study designed to compare the efficacy of two drugs in lowering blood pressure, patients were paired according to their gender, age and disease severity. Patients within each pair were randomly allocated to one of the two drugs. Summary statistics for the decrease in blood
You conduct a study on the effect of type of defense counsel on the outcome of a criminal trial. You have the information from a random sample of 20 criminal trials on the outcome of the trial (0 = acquitted, 1 = convicted) and type of defense counsel (0 = private, 1 = public defender). With these data, you run a logistic regres
Please try to include the following three elements for each of the question: ? Hypotheses (both null and alternative hypotheses) ? Analysis (Relevant SPSS printouts or Excel) ? Conclusion (interpretation of data) ? Do not need to outline and examine the assumptions that the chosen statistical technique makes (e.g., the distr
SPSS computation and Interpretation: The Asian economy faltered during the last few months of 1997. Investors anticipated that the downturn in the Asian economy would have a negative effect on the earnings of companies in the United States during the fourth quarter of 1997. The following sample data show the earnings per share f
Perform hypothesis testing on one variable's data. (Choose either intrinsic or extrinsic column). I chose the extrinsic Perform a t-test by formulating a null and an alternative statement, choosing an acceptable significance value, selecting the test statistic and determining its value from the sample data, comparing the observ
The author collected data consisting of the month of birth of actors who won Oscars. Use a 0.05 significance level to test the claim that Oscar winning actors are born in different months with the same frequency. Month Jan Feb Mar April May June July Aug Sept Oct Nov Dec Number 9 5 7 14 8 1 7 6 4 5 1 9
Question (1): A random sample of 15 observations from the first population revealed a sample mean of 350 and a sample standard deviation of 12. A random sample of 17 observations from the second population revealed a sample mean of 342 and a sample standard deviation of 15. At the .10 significance level, is there a difference i
Ms. Lisa Monnin is the budget director for Nexus Media, Inc. She would like to compare the daily travel expenses for the sales staff and the audit staff. She collected the following sample information. Sales ($) 131 135 146 165 136 142 Audit ($) 130 102 129 143 149 120 139 At the .10 significance level, can she conclude t
The management of Discount Furniture, a chain of discount furniture stores in the Northeast, designed an incentive plan for salespeople. To evaluate this innovative plan, 12 salespeople were selected at random, and their weekly incomes before and after the plan were recorded. Salesperson Before After Sid Mahone $320 $34
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
A random sample of 15 observations from the first population revealed a sample mean of 350 and a sample standard deviation of 12. A random sample of 17 observations from the second population revealed a sample mean of 342 and a sample standard deviation of 15. At the 0.10 significance level, is there a difference in the populati
According to the historical data, the life expectancy in the United States is less than or equal to the life expectancy in Ireland. A new study has been made to see whether this has changed. Records of 270 individuals from the United States who died recently are selected at random. The 270 individuals lived an average of 77.5 y
Past records suggest that the mean annual income, mu1, of teachers in state of Georgia is greater than or equal to the mean annual income, mu2, of teachers in Indiana. In a current study, a random sample of 20 teachers from Georgia and an independent random sample of 20 teachers from Indiana have been asked to report their mean
Past records suggest that the mean annual income, mu1, of teachers in state of Arizona is greater than or equal to the mean annual income, mu2, of teachers in Nevada. In a current study, a random sample of 20 teachers from Arizona and an independent random sample of 20 teachers from Nevada have been asked to report their mean an
The historical reports from two major networks showed that the mean number of commercials aired during prime time was equal for both networks last year. In order to find out whether they still air the same number of commercials on average or not, random and independent samples of 90 recent prime time airings from both networks h
Using AIU's large database of survey responses from the AIU data set, complete the following: Perform hypothesis testing on one variable's data. (Choose either the intrinsic or extrinsic column.) Perform a t-test by formulating a null(in equation format) and an alternative statement(in equation format), choosing an acceptabl
Identify the null hypothesis , alternative hypothesis, test statistic, p-value or critical value(s), conclusion about the null hypothesis, and final conclusion that addresses the original claim. Travel Through the Internet - Among 734 randomly selected internet users, it was found that 360 of them use the internet for makin
In previous tests, baseballs were dropped 24ft onto a concrete surface, and they bounced an average of 92.84% in. In a test of a sample of 40 new balls, the bounce had a mean of 92.67 in. and a standard deviation of 1.79 in. Use a 0.05 significance level to determine whether there is sufficient evidence to support the clam tha
More shoppers do their majority of grocery shopping on Saturday than any other day of the week. However, is the day of the week a person does the majority of grocery shopping dependent on age? A study cross-classified grocery shoppers by age and major shopping day ("Major Shopping by Day ," Progressive Grocer Annual Report, Ap
Can students save money by buying their textbooks at Amazon.com? To investigate this possibility, a random sample of 15 textbooks used during a recent semester at Miami University was selected. The prices for these textbooks at both a local bookstore and through Amazon.com were recorded. The prices for the textbooks, includin
A data set can be found at the Data and Story Library site: http://lib.stat.cmu.edu/DASL by searching for Friday the 13th materials. The data were collected in an effort to study various aspects of human behavior on Friday 13th by monitoring the change in traffic patterns between Friday the 6th and the subsequent Friday the 1