7. (9.56) According to Gartner Inc., the largest share of the worldwide PC market is held by Hewlett-packard with 18.4%. Suppose that a market researcher believes that Hewlett Packard holds a higher share of the market in the western region of the United States. To verify this theory, he randomly selects 428 people region of the United States. Eighty-four of these purchases were Hewlett-packard What is the probability of making a Type I error: Answer: : P 0.184 right tail n = 428-F P = 0.184 2.272??- ?.??? = 84/428 = 0.19626 Z = 0. (+( ?-P) 2377To75 2.33 ??? = = 0.6546 Fail to reject the null hypothesis. P(Z > z) = P(Z > 0.6546) = P(Z