The Computer Security Institute (CSI) conducts an annual survey of computer crime at United States businesses. CSI sends survey questionnaires to computer security personnel at all U.S. corporations and government agencies. A total of 351 organizations responded to the 2010 CSI survey. Of these, 144 admitted unauthorized use of computer systems at their firms during the year. (CSI Computer Crime and Security Survey, 2010/2011.) Let p represent the true proportion of U.S. organizations that experience unauthorized use of computer systems at their firms.

a. Calculate a point estimate for p.

b. Set up the null and alternative hypothesis to test whether the value of p differs from .35.

c. Calculate the test statistic for the test, part b.

d. Find the rejection region for the test if α = .05.

e. Use the results of parts c and d to make the appropriate conclusion.

f. Find the p-value of the test and confirm that the conclusion based on the p-value agrees with the conclusion in part e.