Use the R computer package to produce a plot of the mean HW vs Y ear grouped by Race….

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Use the R computer package to produce a plot of the mean HW vs Y ear grouped by Race. The scale

of the vertical and horizontal axes of your gure should be identical to Figure 1 below. Make sure that

the Y ear variable is treated as discrete in your plot rather than continuous (3 marks). Do you think

that the interaction e ect between Y ear and Race should be included in the marginal model? Explain.

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