We can use the normal distribution to make confidence interval estimates for the population proportion, p, when _____.
A) np ≥ 5
B) n(1 − p) ≥ 5
C) p has a normal distribution
D) np ≥ 5 and n(1 − p) ≥ 5

Question

Quizplus · Accepted Answer

For the normal distribution to be used in making confidence interval estimates for the population proportion, both np ≥ 5 and n(1-p) ≥ 5 should be true. This ensures that the sample size is large enough to meet the normality assumption. Therefore, D is the correct choice.

We Can Use the Normal Distribution to Make Confidence Interval