The t-distribution for developing a confidence interval for a mean has degrees of freedom.
A) n + 2
B) n +1
C) n
D) n - 1
E) n - 2

Question

Quizplus · Accepted Answer

The correct formula for the degrees of freedom for a t-distribution when developing a confidence interval for a mean is n - 1. This is because we are estimating the population standard deviation using the sample standard deviation, which introduces an additional source of variability and reduces the effective sample size by one.

The T-Distribution for Developing a Confidence Interval for a Mean