The rule of five is used to ensure that the discrete distribution of the test statistic can be approximated by the continuous Chi-squared distribution.

Question

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The rule of five states that each cell in a contingency table should have at least five expected cases in order for the Chi-squared test to be valid and for the distribution of the test statistic to be approximately Chi-squared. This assumption is necessary for the approximation to be valid and for the p-values to be accurate.

The Rule of Five Is Used to Ensure That the Discrete