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How to Remember the Definition of Type I and Type II errors

 There are some clever mnemonics Type 1 error: Rejecting H0 when it is true Type II Error: Not rejecting H0 when it is false source1 Here are the mnemonics to remember: 1. Remember the story where the boy cried wolf  H0 : There is no wolf H1: There is a wolf data sample: Boy's cry Type I Error:  The first error the villagers made (when they believed him) was a type 1 error. Type II Error:  The second error the villagers made (when they didn't believe him) was a type 2 error 2. This has some truth in it. But can be ageism also Young scientists commit Type-I because they want to find effects and jump the gun while old scientist commit Type-II because they refuse to change their beliefs. 3.  A Type I error is a false POSITIVE; and P has a single vertical line. A Type II error is a false NEGATIVE; and N has two vertical lines. 4.  Type I errors are of primary concern Type II errors are of secondary concern 5. Remember RAAR, Reject when you should Accept ( type...