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Unformatted text preview: Statistical Significance levels • Alpha level: – The selected maximum risk of Type I Error that is acceptable • Probability value (pvalue): – The smallest probability of a Type I Error you could have adopted and still rejected the null hypothesis. Wednesday, June 1, 2011 OneSample Statistics N Mean Std. Deviation Std. Error Mean bloodsugar 102.0000 8.21922 2.59915 OneSample Test.769 9 .4612.000007.8797 3.8797 bloodsugar t df Sig. (2tailed) Mean Difference Lower Upper 95% Confidence Interval of the Difference Test Value = 0 Wednesday, June 1, 2011 • Suppose df=9, and observed t = .769, and you have a more thorough table of critical values for the ttest. df .50 .40 .30 .20 .10 .05 1 2 … 9 .70ish .80ish 1.0ish 1.383 1.833 2.262 An observed ttest statistic: .769 If you had adopted alpha = ~.47, you would have rejected your null hypothesis, but with a .47 risk of a false alarm/Type I error. Alpha levels Wednesday, June 1, 2011...
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 Spring '10
 DAMARE
 Statistics, Null hypothesis, Statistical hypothesis testing, Wednesday, Additional Hypothesis Testing, Null false/Alternative Hypothesis

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