The t-distribution should be used when the sample size is large (n 30) and the population standard deviation is unknown.

Question

The t-distribution should be used when the sample size is large (n > 30) and the population standard deviation is unknown.

Quizplus · Accepted Answer

The t-distribution should be used when the sample size is small (n < 30) and the population standard deviation is unknown. When the sample size is large (n ≥ 30), the sample mean is normally distributed by the Central Limit Theorem, even if the population distribution is not normal, and the standard normal distribution should be used instead of the t-distribution.

The T-Distribution Should Be Used When the Sample Size Is