Instruction 10-9 A Corporation Randomly Selects 150 Salespeople and Finds That 66

Instruction 10-9
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 Instruction 10-9,what is/are the critical value(s) when performing a Z test on whether population proportions are different if α = 0.05?

A) ± 1.96
B) -1.96
C) ± 2.08
D) ± 1.645