Chi square test for variance

[Wes Loewer]

I agree, this would be very useful to have Hypothesis Testing and Confidence Intervals for standard deviation/variance for 1 and 2 sample cases.

Interestingly, the TI84+ and Nspire calculators have the 2 sample F-Test for standard deviation, but none of the other standard deviation Intervals or Tests. That always struck me as being odd to leave certain ones out.

-wes