A new policy of "flex hours" is proposed. Random sampling showed that 28 of 50 female workers favored the change, while 22 of 50 male workers favored the change. Management wonders if there is a difference between the two groups. For a test comparing the two proportions, the assumption of normality for the difference of proportions is:
A)clearly justified.
B)clearly unjustified.
C)a borderline call.

Question

Quizplus · Accepted Answer

The sample sizes are large enough (both are 50), and the number of successes and failures in each group are greater than 5, which justifies the normality assumption for the difference of proportions.

A New Policy of "Flex Hours" Is Proposed