The Population of All Sample Proportions Has a Normal Distribution

Multiple Choice

The population of all sample proportions has a normal distribution if the sample size (n) is sufficiently large. The rule of thumb for ensuring that n is sufficiently large is

A) np ≥ 5.
B) n(1 − p) ≥ 5.
C) np ≤ 5.
D) n(1 − p) ≤ 5 and np ≤ 5.
E) np ≥ 5 and n(1 − p) ≥ 5.