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. What​ is/are the critical​ value(s) when performing a Z test on whether population proportions are different if α=​0.05? Round to three decimal places.   A. −1.960   B. ±1.960   C. ±1.645   D. ±2.080

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