Links: channel, this video
This is the 3rd of 5 videos in a playlist that describes 4 concepts at the heart of Inferential Statistics and how they work together. The first two were on the concept of p, the p-value and Alpha, the Significance Level. The 4th will be on Test Statistic. The 5th video will concentrate on how they all interrelate and work together.
Here are the 3 Keys to Understanding (KtUs) the concept of Critical Value:
And here are two concept flow diagrams which help explain the 1st KTU:
And here is a Compare and Contrast Table which helps explain how p > α is the same as test statistic value < critical value.
Andrew A. (Andy) Jawlik is the author of the book, Statistics from A to Z -- Confusing Concepts Clarified, published by Wiley.