ANOVA conclusion PowerPoints

# ANOVA conclusion PowerPoints - Analysis of Variance...

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Unformatted text preview: Analysis of Variance Continued October 8, 2007 ANOVA table Source Sum of Squares df Mean square F p eta 2 Between 32 2 16 7.2 <.05 .62 Within 20 9 2.22 Total 52 11 Reporting in APA style F(2,9) = 7.2, p < .05, eta 2 = .62 • Can write out eta 2 or can write η 2 • What can we conclude thus far? There was a significant effect of memory test type on how many words were remembered, F(2,9) = 7.2, p < .05, eta 2 = .62, with a large effect. • So far, all can say • Need to conduct post-hoc tests Post hoc tests • means “after the fact” • do ONLY after reject the null hypothesis that all population means equal • each test compares pair of means, like independent t-test • many possible post-hoc tests; covering two – Tukey’s HSD -- use when have equal ns in each group or SPSS can do it for you – Fisher’s protected t -- use when don’t have equal ns and can’t use SPSS Tukey’s HSD • Will use because have equal ns • Single test - get single value that’s a critical value • Calculates amount any pair of means need to be apart to be significant Absolute value of mean difference needs to be larger...
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## This note was uploaded on 05/04/2008 for the course PSYCH 207 taught by Professor Wiseman during the Fall '08 term at Allegheny.

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ANOVA conclusion PowerPoints - Analysis of Variance...

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