In the sign test applications,the normal approximation to the binomial distribution may be used whenever the number of nonzero differences exceeds:
A)5
B)10
C)20
D)15

Question

Quizplus · Accepted Answer

According to the normal approximation to the binomial distribution, the minimum requirement is that the expected number of successes and failures should be greater than 5. In the sign test, each nonzero difference is a success, and each zero difference is a failure. Therefore, the number of nonzero differences should be at least 6. However, to be safe and ensure accurate results, it's recommended that the number of nonzero differences should be at least 20. Therefore, the best choice is C.

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