请问这个知识点是在哪个视频中有说呀？

问题如下：

Which of the following should be used to test the difference between the variances of two normally distributed populations?

选项：

A.

t-test

B.

F-test

C.

Paired comparisons test

解释：

B is correct.

An F-test is used to conduct tests concerning the difference between the variances of two normally distributed populations with random independent samples.

F-test适用于检测两个方差的不同