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An occupational health practitioner wishes to find out whether there is a statistically significant
association between level of exposure to coal dust (low, moderate, high) and stage of lung
disease (low, moderate, high) based on data gathered from a random sample of n = 400 mine
workers at Kimberley: The expected values are in brackets. The calculated value of Y 2 , the chi-
square statistic used to test the null hypothesis of independence, is equal to: Select one: a. 126.62
b. 50.633 c. 20.68 d. 53.28

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