When applying chi square to a 2 by 2 contingency table, each fo must be at least equal to 10.

Name: When applying chi square to a 2 by 2 contingency table, each fo must be at least equal to 10.
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Quizplus · Accepted Answer

This is a common misconception. While it is ideal for each cell to have an expected frequency of at least 5, a minimum expected frequency of 1 is necessary for each cell. Therefore, in a 2 by 2 contingency table, each fo can be as low as 1 for the chi square test to be valid.

When Applying Chi Square to a 2 by 2 Contingency