Question

fill in the blank.
if a sample size is less than ______, the sample size must come from a population having a normal distribution in order to follow normal distribution calculations.
a. 40
b. 100
c. 50
d. 30

Explanation:

According to the Central Limit Theorem, when the sample size \(n\geq30\), the sampling distribution of the sample mean \(\bar{x}\) is approximately normal regardless of the shape of the population distribution. When \(n < 30\), the sample must come from a normally - distributed population to use normal distribution calculations.

Answer:

D. 30