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When we analyze data for the census tracts in the greater Los Angeles area, we find no significant correlation between median tax bill and median

When we analyze data for the census tracts in the greater Los Angeles area, we find no significant correlation between median tax bill and median lot size. Yet a considerable positive correlation occurs when we control for the percentage of the tract used for business. Explain how the percentage of the tract used for businesses could be a suppressor variable if it is positively correlated with median tax bill and negatively correlated with median lot size.


(2)Statistical interactions.Agresti & Finlay p. 316, problem 10.22 (7.5 points)

For lower-level managerial employees of a fast-food chain, the prediction equation relating Y = annual income (thousands of dollars) to = number of years experience on the job equals = 14.2 + 1.1for males and = 14.2 + 0.4for females. Explain how these equations show evidence of statistical interaction.

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