Two Well-Known Aviation Training Schools Are Being Compared Using Random

Multiple Choice

Two well-known aviation training schools are being compared using random samples of their graduates. It is found that 70 of 140 graduates of Fly-More Academy passed their FAA exams on the first try, compared with 104 of 260 graduates of Blue Yonder Institute. To compare the two proportions, the assumption of normality of the test statistic is:

A) justified, but it is a borderline case.
B) clearly justified.
C) clearly not justified.