Unformatted text preview: When calculating a Z score for a given raw score of Y: When calculating a Y when given a Z score: When comparing a mean of a sample to a known parameter and you know the standard deviation for the population: √
When comparing a mean of a sample to a known parameter but you DO NOT KNOW the standard deviation of the population: √ Degrees of freedom in this case – N‐1 For comparing two independent sample means: Calculating the Standard Error of the difference between means when Variances are equal 1 1 2 When Variances are not equal, when one is more than twice the other. Degrees of freedom for two independent means is (N1+N2) ‐ 2 When comparing proportions: (Use z for comparing proportions) 1 1 ...
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 Spring '11
 Heberle
 Standard Deviation, Standard Error, raw score, independent means, independent sample

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