TABLE 10-10
A corporation randomly selects 150 salespeople and finds that 66% who have never taken a self-improvement course would like such a course. The firm did a similar study 10 years ago in which 60% of a random sample of 160 salespeople wanted a self-improvement course. The groups are assumed to be independent random samples. Let π₁ and π₂ represent the true proportion of workers who would like to attend a self-improvement course in the recent study and the past study, respectively.
-Referring to Table 10-10, what is/are the critical value(s) when testing whether the current population proportion is higher than before if α = 0.05?
A) ±1.645
B) + 1.645
C) ±1.96
D) + 1.96

Question

Quizplus · Accepted Answer

Since the test is one-tailed (testing if the current proportion is higher), the critical value for α = 0.05 is +1.645.

TABLE 10-10 A Corporation Randomly Selects 150 Salespeople and Finds That 66