Introduction
This chapter gives a summary of the essential concepts of probability needed for the statistical tests covered in this book. More advanced material that will be useful if you go on to higher-level statistics courses is in Section 7.6.
Probability
The probability of any event can only vary between zero (0) and one (1) (which correspond to 0% and 100%). If an event is certain to occur, it has a probability of 1. If an event is certain not to occur, it has a probability of 0.
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