Question: The figure for this exercise shows data for the relationship between the average stopping distance (feet) of a car when the brakes are applied and

The figure for this exercise shows data for the relationship between the average stopping distance (feet) of a car when the brakes are applied and vehicle speed (miles per hour).

The regression line for these data is also shown on the plot.

(Note: The raw data were given in Exercise 3.7.)

a. Which one of the five necessary conditions for linear regression appears to be violated in this situation?

b. What corrective action would you take to correctly estimate the connection between stopping distance and vehicle speed?

c. Make a sketch that illustrates the pattern of a plot of residuals versus speed for the data shown in the figure in this exercise. Your sketch does not need to be numerically accurate but should correctly show the pattern of the plot.

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