37. The Heldrich Center for Workforce Development found that 40% of Internet users received
more than 10 e-mail messages per day. A similar study on the use of e-mail was repeated in
2002.
A. Formulate the hypotheses that can be used to determine whether the proportion of Internet
users receiving more than 10 e-mail messages per day increased.
B. If a sample of 425 Internet users found 189 receiving more than 10 e-mail messages per day,
compute the test statistic
C. Compute the p value for the test statistic
D. At a = 0.5, what is your conclusion about the hypotheses?
E. state the conclusion within the context of the problem.
38. Five years ago the average size of farms in a state was 160 acres. From a recent survey of 27 farms, the mean and standard deviation were found to be 180 and 36 acres, respectively. Is there strong evidence that the average farm size is larger than what is was 5 years ago?
