The chi-square distribution for developing a confidence interval for a standard deviation has degrees of freedom.
A) n + 2
B) n +1
C) n
D) n - 1
E) n - 2

Question

Quizplus · Accepted Answer

The chi-square distribution for developing a confidence interval for a standard deviation has degrees of freedom equal to n - 1. This is because we are estimating the population standard deviation using the sample standard deviation, which requires us to subtract one degree of freedom from the total sample size (n). Therefore, the correct choice is (D) n - 1.

The Chi-Square Distribution for Developing a Confidence Interval for a Standard