SCENARIO 10-10
a Corporation Randomly Selects 150 Salespeople and Finds $\pi$

Multiple Choice

SCENARIO 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 $\pi$ ₁ and $\pi$ ₂ 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 Scenario 10-10,what is/are the critical value(s) when testing whether the current population proportion is higher than before if ? = 0.05?

A) $\pm$ 1.645
B) + 1.645
C) $\pm$ 1.96
D) + 1.96