Testing Claims About Standard Deviation (using Chi-Square)
This video explains the least-common type of hypothesis test: testing claims about the standard deviation of a sample relative to the standard deviation of the population. Since you've already done so many hypothesis test problems about proportions and means, this is a relatively plug-and-chug affair.
If you do not have an account, you should get one, because it is awesome! You can save a playlist for each test or each chapter, and save your "greatest hits" into a "watch right before the final" list (not that we recommend cramming, but when in Rome...)