why-must-both-np-and-nq-be-at-least-5-to-use-the-normal-approximation-for-the-sa

Question

Why must both np and nq be at least 5 to use the normal approximation for the sampling distribution of p̂?

Accepted Answer

To ensure the distribution is approximately symmetric and not too skewed.

Answer

To guarantee the sample size is large enough.

Answer

To ensure p is not equal to q.

Answer

To make the calculations easier.