An investigation of the relationship between x traffic flow
An investigation of the relationship between x = traffic flow (thousands of cars per 24 hours) and y 5 lead content of bark on trees near the highway (mg/g dry weight) yielded the accompanying data. A simple linear regression model was fit, and the resulting estimated regression line was y^ = 28.7 1 33.3x. Both residuals and standardized residuals are also given.
a. Plot the (x, residual) pairs. Does the resulting plot suggest that a simple linear regression model is an appropriate choice? Explain your reasoning.
b. Construct a standardized residual plot. Does the plot differ significantly in general appearance from the plot in Part (a)?
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