ANOVA intro PowerPoint

ANOVA intro PowerPoint - Analysis of Variance October 3,...

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Analysis of Variance October 3, 2007
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Experiments with more than 2 groups lots of reasons to have experiment with > 2 groups see if relationship among levels of IV is linear or curvilinear
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Example experiment Participants given 1 minute to learn list of 10 words After delay, given one of three memory tests: recognition, cued recall, free recall DV: # words each participant correctly remembered
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Data for 12 participants Recognit ion Cued Recall Free Recall 8 8 2 9 7 4 7 4 4 8 5 6 M =  8 M =  6 M =  4 Memory test type
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How would we analyze this data? Three t-tests to compare each pair of groups? Violates rules of probability that underlie statistical significance p=.05 means 1 out of every 20 tests will get a test statistic that high or higher by chance Now done THREE tests Probability of making Type I error called experiment-wise error rate
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Instead… Do single test called analysis of variance (ANOVA) Also called omnibus (overall) F test Statistic calculate is F
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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 intro PowerPoint - Analysis of Variance October 3,...

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