The Statistic (N - 1)s² $\sigma$ ² Has a Chi-Squared Distribution with N - 1 Degrees

Multiple Choice

The statistic (n - 1) s² / $\sigma$ ² has a chi-squared distribution with n - 1 degrees of freedom if:

A) the sample has a Student t-distribution with degrees of freedom equal to n - 1.
B) the sample is normally distributed with variance equal to s².
C) the population is normally distributed with variance equal to $\sigma$ ².
D) All of these choices are true.