Unformatted text preview: β = P (H is not rejected | H is false) The value of 1 – β is called the power of the test . It represents the probability of NOT making a Type II error. Example where H : “innocent until proven guilty” Actual situation Innocent Guilty Find not guilty Correct Decision Type II or β error Jury’s decision Find guilty Type I or α error Correct Decision These 2 errors are dependent. For a fixed sample size, lowering α will raise β and vice versa. Decreasing α and β simultaneously requires increasing the sample size. Further information on the errors are not covered in this course....
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- Winter '10
- Null hypothesis, Statistical hypothesis testing, Type I and type II errors, Statistical power, β, α