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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, Null hypothesis, Statistical hypothesis testing, Statistical significance, Statistical power

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