This video covers a couple of vocab words that you'll be expected to know for your statistics class. Will they be on the test? Depends on your teacher, though almost everyone is supposed to know that standard deviation is biased, whatever that means.
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...)