The t-distribution with n -1 degrees of freedom is often used to construct confidence intervals of the population mean when the population standard deviation is known.

Question

Quizplus · Accepted Answer

The t-distribution with n-1 degrees of freedom is actually used when the population standard deviation is unknown and must be estimated from the sample. If the population standard deviation is known, then the standard normal distribution should be used instead.

The T-Distribution with N -1 Degrees of Freedom Is Often