VO2-max Aerobic Fitness Measurements Consider the modeling

Chapter 13, Problem 13.4.3

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VO2-max Aerobic Fitness Measurements Consider the modeling of aerobic tness described in 13.2.4 and the data set in DS 13.2.4. Suppose that a model is used with VO2-max as the dependent variable and with heart rate at rest and percentage body fat as input variables. (a) Make plots of the residuals against the tted values and against each of the two input variables. Are you alerted to any problems with the regression model? (b) Make a plot of the residuals against the variable weight. Why does this plot conrm that the variable weight is not needed in the regression model?(c) Verify that there are no points with an unusually large inuence on the regression model. (d) Verify that there is one point with a standardized residual of2.15.

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