In the sign test applications, the normal approximation to the binomial distribution may be used whenever the number of nonzero differences is greater than or equal to:
A) 5
B) 20
C) 10
D) 30

Question

Quizplus · Accepted Answer

The normal approximation to the binomial distribution can be used when the sample size is large enough, and a commonly used rule of thumb is that the sample size should be at least 10 times the number of successes or failures being counted (in this case, nonzero differences). Therefore, since we are looking for the minimum number of nonzero differences that meets this criterion, the answer is 10, which corresponds to choice C.

In the Sign Test Applications, the Normal Approximation to the Binomial