As a rule of thumb, the sampling distribution of the sample proportions can be approximated by a normal probability distribution whenever
A) np $\ge$5, n $\ge$30.
B) np $\ge$5 and n(1-p) $\ge$5.
C) n $\geq$ 30 and (1 - p) = 0.5.
D) none of these alternatives is correct.

Question

Quizplus · Accepted Answer

The sampling distribution of the sample proportion can be approximated by a normal distribution when both np and n(1-p) are greater than or equal to 5, ensuring that there are enough successes and failures in the sample.

As a Rule of Thumb, the Sampling Distribution of the Sample