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The Complete Idiot's Guide to Statistics, 2nd Edition by Robert Donnelly

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One-Way Analysis of Variance

If you want to compare the means for three or more populations, ANOVA is the test for you. Let’s say I’m interested in determining whether there is a difference in consumer satisfaction ratings between three fast-food chains. I would collect a sample of satisfaction ratings from each chain and test to see whether there is a significant difference between the sample means. Suppose my data look like the following:
614
My hypothesis statement would look like the following:
H0 : µ1 = µ 2 = µ3
H1 : not all µ’s are equal
Essentially, I’m testing to see whether the variations in customer ratings from the previous ...

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