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Chi square test for independence of attributes.

A researcher is studying the effects of smoking on overall health by taking a random sample of 500 people between the ages of 25-60. The researcher defines the IV variable "Level of Smoking" into three categories: Non-smoker; Light Smoker; and Heavy Smoker. The researcher defines DV variable "Overall Health" into three categories: Excellent, Fair, and Poor. The IV is compared to the DV in a cross-tab. Which measure of association would researcher use to compare the relationship between the IV and DV? Why?

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