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Unformatted text preview: • If the power of an experiment with is 0.5 (2 tails, =.05) then what will the new α power be if everything remains the same but the N increases to 4N? • (Assume normal score distribution and known σ X ) • If the power of an experiment with is 0.6 (2 tails, =.05) then what will the new α power be if everything remains the same but the N decreases to N/2? • (Assume normal score distribution and known σ X ) Where we are Where we are going Statistical analyses by number of sample groups 1  Single sample Z or t tests 2 – T tests (dependent, independent) 3 or more ? Analysis of variance Between subjects (independent) Equal N (Easy) Unequal N (Harder – structural) Within subjects (dependent – structural) Twoway (independent  structural) Analysis of Variance Equal N (Easy) Used with 3 or more groups Extends logic of independent groups ttest Some additional things to think about ASSUMPTIONS of ANOVA: equal variances (required for pooling) normality (required for test distribution)...
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 Spring '10
 SHAMS
 Normal Distribution, Variance, Null hypothesis

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