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

question 191

Multiple Choice

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