11 - 3/21/11 Simple ANOVA o Used anytime there is only one...

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3/21/11 Simple ANOVA o Used anytime there is only one IV or treatment o Anytime there are more than two levels of treatment- in our example diet is the treatment o When looking at differences in average scores across groups The F-Statistic o Named after R.A. Fisher- famous geneticist and evolutionary biologist o Considered one of the foremost evolutionary biologists of the early 20 th century and one of the finest biologists since Darwin o Very similar in meaning to the t-statistic o Used df in the table to determine the critical value needed to reject the null. F-formula o F=MS between/MS within Mean of Squares (Mean of variance) The statistic is a ratio that examines variance in scores between groups while accounting for variance within groups Within group variance is (usually) due to chance o If F>1 We have an effect- we have average variability between groups that is greater than within group variability F Stat o The F stat is two groups is a simple transformation of t
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11 - 3/21/11 Simple ANOVA o Used anytime there is only one...

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