วีดีโอ

You are a great professor. Thanks for your effort in explaining this in a way that is actually easier to understand. Greetings from Brazil.

*promo sm*

The assumptions for each t-test are checked in this video: th-cam.com/video/0nfPSH1H9WU/w-d-xo.html

The standard deviation is off by about .1 -- this changes the actual t-score, but in this case the outcome is still the same. So, it doesn't change the material claims in the solution.

At 2:51 I say "universal set" and I mean referring to the population as the universal set, but after listening again, I think it sounds like I am saying that the sample is the universal set. So, to be clear: The population could be considered a universal set and the sample is a subset thereof.

If you want to skip my introduction, just go to about 3:05 🤓

At 11:56 I wrote the statement wrong. It should have said: "The complement of the intersection is the union (not intersection) of the complements."

Thank.