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1. A 2005 study found that 202 women held board seats out of a total of 1,195 seats in the Fortune 100 companies. A 2003 study found that 779 women held board seats out of a total of 5,727 seats in the Fortune 500 companies. Treating these as random samples (since board seat assignments change often), can we conclude that Fortune 100 companies have a greater proportion of women board members than the Fortune 500? (a) State the hypotheses. (b) Calculate the sample proportions. (c) Find the test statistic and its p-value. What is your conclusion at & 945; = .05? (d) If statistically significant, can you suggest factors that might explain the increase? (Data are from The 2003 Catalyst Census of Women Board Directors of the Fortune 500, and "Women and Minorities on Fortune 100 Boards," The Alliance for Board Diversity, May 17, 2005.)
Jack is doing a project in educational psychology. Before the experiment, he rank-orderes all his participants according to achievement test scores.
a. Solve using the p value approch. b. Solve using the classical approch.
If a manager wishes to develop a confidence interval estimate for estimating the difference between two population means, an increase in the size of the samples used will result in:
A sample of 25 MBA students taking OTM course in the Spring of 2013 shows an average income of $85,000 with the sample standard deviation of $5,000. Find the 95% confidence interval of the population mean income of MBA students.
Using α = 0.05, does this sample provide enough evidence to conclude that the average utility bill in Delaware was lower in the winter of 2011-2012 than it was in the winter of 2010-2011?
You take a random sample around town and calculate a p-value for your hypothesis test of 0.0913. What is the appropriate conclusion? Conclude at the 5% level of significance.
Suppose a simple random sample of 20 non-English student have an average math score on the SAT exam of 528. What are the appropriate hypotheses?
Assuming the population is large, which sample size will give the smallest standard deviation to the statistic and select the numbers for the first five to be interviewed.
The margin of error for a sample size 25 is +-3. Will the margin of error be greater or less if the sample size is 400? What is the new margin of error?
Use the binomial distribution in the Data Analysis add - in to simulate the distribution of men and women among the next ten arrivals at an emergency room, assuming that, on average, six people out of ten who arrive are men.
By using the fact that Martha believes the treatment will decrease the amount of time to fall asleep, describe the null and alternate hypotheses.
One of the major measures of the quality of service provided by any organization is the speed with which responds to customer complaints. A large family-held department store selling furniture and flooring, including carpet, had undergone a major ..
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