A corporation randomly selects 150 salespeople and finds that66% who have never taken aself-improvement course would like such a course. The firm did a similar study 10 years ago in which60% of a random sample of 160 salespeople wanted aself-improvement course. The groups are assumed to be independent random samples. Let 1 and 2 represent the true proportion of workers who would like to attend aself-improvement course in the recent study and the paststudy, respectively. What is the point estimate for the difference between the two populationproportions?

A.

0.22

B.

0.10

C.

0.06

D.

0.15