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41

Anova

In reality, we can rarely look at one variable at a time

Example:

t-test:    Subjects who use crest have fewer                                           cavities

anova: toothpaste x age    Subjects who are 12 or less have    fewer cavities with crest.    Subjects who are older than 12 have    fewer cavities with no-teeth.

cavities

0

5

crest

no-teeth

cavities

0

5

crest

no-teeth

age 0-6

age 7-12

age >12

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