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    A chi-square test for independence of three groups

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    Please provide steps to solve the following question.

    A study is designed to investigate whether there is a difference in response to various treatments I patients with chronic pain. The data are shown below. Are symptoms independent of treatment? Conduct a chi square test at a 5% level of significance.
    Df = ?
    Critical value = ?

    Symptoms worsened // No effect // Symptoms improved // Total
    Treatment 1 22 14 14 50
    Treatment 2 14 15 21 50
    Treatment 3 9 12 29 50

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    Solution Summary

    The solution gived detailed steps on performing a chi-square test for independence of three groups. All formula and calcuations are shown and explained.