Last year,10 percent of all teenagers purchased a new iPhone.This year,a sample of 260 randomly chosen teenagers showed that 39 had purchased a new iPhone.To test whether the percent has risen,the critical value at α = .05 is:

Question

Quizplus · Accepted Answer

The test is a one-tailed z-test for proportions. At α = 0.05, the critical value for a one-tailed test is 1.645.

Last Year,10 Percent of All Teenagers Purchased a New IPhone