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Chapter 6: Introduction to Inference
Section 6.4: Error Probabilities and Power
The first two paragraphs of this section are a good summary of this chapter. Read them.
Type I and Type II errors
| | Truth about the population |
| | H0 true | H0 false |
Decision based on sample | |
Type I error | Correct decision | Correct decision | Type II error |
|
Error probabilities
These probabilities help one decide whether the test is satisfactory.
The probability of a Type I error (i.e., rejecting H0 when it is true) is equal to the significance
level, α.
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Last revised: July 19, 2016 6:01 p.m.