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Why are Chi Square tests necessary?

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Chi Square tests are used when our data is categorical. In other words, we have frequencies or counts of data points occurring in different groups.

One category of "College Bar":

Study Street Bar & GrilleExam Street SocialQuiz Bar
Observed values30128

Two categories of "Bid status" and "Hat type":

Backwards hatNo hatBucket hat Total
Received bid2110839
Did not receive bid1326746
Total34361585

Z-scores and t-scores are used with continuous data that don't belong to given categories or groups!

That's why we need Chi Square tests!

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