The approximation to a normal distribution can be assumed for sample sizes of _____.
A)15
B)20
C)25
D)30 or more

Question

Quizplus · Accepted Answer

According to the Central Limit Theorem, as the sample size increases, the distribution of the sample mean approaches a normal distribution regardless of the underlying population distribution. A sample size of 30 or more is generally considered sufficient for the normal approximation to be valid. Therefore, choice D is the best answer.

The Approximation to a Normal Distribution Can Be Assumed for Sample