A least-squares regression line was used to model the relationship between putting average (on greens hit in regulation) and scoring average for golfers on the 2009 PGA tour. The corresponding residual plot is shown below.

a) Based on the residual plot, is a linear model appropriate for this association? Explain.

b) The point highlighted in red is for the golfer David Duval. Estimate his residual from the graph and interpret its value.

c) If you were to predict the scoring average for a golfer with a putting average of 1.861.86, would you expect your prediction to be too low, too high, or just about right? Explain.


Answered 1 year ago
Answered 1 year ago
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a. Recall that we can say that a model is appropriate for an association if the residual plot does not show any left-over pattern. Based on the residual plot, there is no left-over quadratic pattern left. Thus, the linear model is appropriate for the association.

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