The residual plots below are for the linear model fit in Exercise 6.10 predicting length from height for 147 male guppies.

(a) From a plot of residual values versus predicted values, are the assumptions of linearity and constant variability satisfied? Explain your answer.

(b) Is it reasonable to assume that the observations were independent, based on the description of the study? Explain your answer.

(c) Are the residuals approximately normally distributed? Explain your answer.

Data From Exercise 6.10

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Residuals 20 20 -20 150 100- Sample Quantiles 160 180 200 220 240 260 280 Height(cm) 50 50 -50 -100 Q-Q Plot of Residuals -2 -1 Theoretical Quantiles 2