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F statistic

Similar to the t-test, we look up the F value in a table, for a given and degrees of freedom to determine significance

Thus, F statistic sensitive to sample size.

Big N           Big Power           Easier to find significance

Small N       Small Power        Difficult to find significance

What we usually want to know is the effect size

Does the treatment make a big difference (i.e., large effect)?

Or does it only make a small different (i.e., small effect)?

Depending on what we are doing, small effects may be important findings

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