題組內容

5. A beer producer claims that the proportion of its customers who cannot distinguish regular from light beer is at most 12 percent. The producer decides to test this null hypothesis against the alternative that the true proportion is more than 12 percent. The decision rule adopted is to reject the null hypothesis if the sample proportion of who cannot distinguish between the two beers exceeds 15 percent.(12%)

b. Suppose that the true proportion of customers who cannot distinguish between these flavors is 0.20. If a random sample of 100 customers is selected, what is the probability of a Type II error?