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Children in the second, fourth, and fifth grades were classified as those who never showed ADD-like behaviour and those who showed ADD behaviour at least

Children in the second, fourth, and fifth grades were classified as those who never showed ADD-like behaviour and those who showed ADD behaviour at least once. The researcher is conducting a chi-square test with an alpha level of .05 to determine whether grade and ADD behaviour are related in some way. What is the critical value of Chi for this test

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