TABLE 10-11
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 ×and × 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 10-11, what is/are the critical value(s) when testing whether the current population proportion is higher than before if ? = 0.05?
A) + 1.96
B) ±1.96
C) ±1.645
D) + 1.645

Question

TABLE 10-11
 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 ×and × 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 10-11, what is/are the critical value(s) when testing whether the current population proportion is higher than before if ? = 0.05?
A) + 1.96
B) ±1.96
C) ±1.645
D) + 1.645

Quizplus · Accepted Answer

The test is a one-tailed test (testing if the current proportion is higher), and with a significance level of 0.05, the critical value for a one-tailed z-test is +1.645.

TABLE 10-11 a Corporation Randomly Selects 150 Salespeople and Finds That