When the sample size is less than 40,the z and the t distributions are almost identical.

Question

Quizplus · Accepted Answer

When the sample size is less than 40, the t distribution is more appropriate to use instead of the normal distribution since the sample size is too small for the standard deviation to be accurately estimated. The t distribution has heavier tails and flatter in the center compared to the normal distribution. Therefore, the z and t distributions are not almost identical.

When the Sample Size Is Less Than 40,the Z and the T