You perform a chi square goodness of fit test to see if the number of birthdays occurring each month matches the expected number (assuming each month is equally likely to be the birth month for any given individual) You get 20.5 as your chi square value. What is the P-value for this test? Or is it undetermined?
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Well, you only get a P value if you choose a critical value for your test. This critical value is usually 0.05 and then the P value is the area outside of your critical region.