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Unformatted text preview: If so, you need strong evidence (small level of significance). There is no sharp border between significant and insignificant, only increasingly strong evidence as the Pvalue decreases. Hawthorne effect Almost any change in the work place together with knowledge that a study is under way will produce a shortterm productivity increase. Statistical Significance Works when: You decide what effect you are seeking Design a study to search for it And use a test of significance to weigh the evidence. Pvalues and their importance Pvalues are more informative than the rejectornot result of a fixed level of significance test....
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 Fall '08
 AKBAS
 Statistics, AP Statistics

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