TABLE 10-11 A Corporation Randomly Selects 150 Salespeople and Finds That 66

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 the unbiased point estimate for the difference between the two population proportions?

A) 0.06
B) 0.15
C) 0.10
D) 0.22