9.25. Refer to the "2005 statewide crime" data set at the text Web site. For all 51 observations, use software to analyze the relationship between y = murder rate and x = poverty rate.

(a) Construct a scatterplot. Does there seem to be a positive or a negative relationship?

(b) Report the prediction equation, and find the predicted murder rate and the residual for D.C. Interpret.

(c) Based on the scatterplot, would you regard D.C. as a regression outlier? Refit the model without it, and note the effect on the slope.