Different from plain-old-normal random sampling (in ways that don't really matter). This video puts the simple in simple random sampling.
This is one of those rare math terms where they tell you what it is just so they can tell you not to do it. What example did I pick to illustrate this point? A bunch of science projects from my kids' elementary school! Enjoy.
Sampling With or Without Replacement
If you're in the habit of deriving and proving statistical formulas in your spare time, then you're definitely going to want to watch someone else's replacement video, since I'm basically going the other direction with it. "With replacement" is the boilerplate of intro stats!
Stratified vs Cluster Sampling
Stratified vs cluster sampling is a common confusion, so that's why I made sure to put them in the same video to confuse you further. Scratch that, I meant "clearly explain the difference". You knew what I meant.
Random sampling sounds good on paper, and in medical studies. But in the real world, it's way easier to use systematic sampling to grab a sample that's almost as good as random.
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...)