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Chi-Square Assumption

Which is not an assumption of the chi-square goodness-of-fit test?
a. the data obtained by a random sample.
b. the expected frequency for each category must be at least five.
c. the expected frequency for each category must be at least three.
d. All are assumptions of the test

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For this test to be valid the expected frequency should be at least 5 in each class. ...

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