41. Microsoft Outlook is the most widely used e-mail manager. A Microsoft executive claims that Microsoft Outlook is used by at least 75% of Internet users. A sample of Internet users will be used to test this claim.

a. Formulate the hypotheses that can be used to test the claim.

b. A Merrill Lynch study reported that Microsoft Outlook is used by 72% of Internet users (CNBC, June 2000). Assume that the report was based on a sample size of 300 Internet users. What is the p-value?

c. At α  .05, should the executive’s claim of at least 75% be rejected?