Use technology for Exercises 75–78. Open the Crash data set, which contains information about the severity of injuries sustained by crash dummies when the National Transportation Safety Board crashed automobiles into a wall at 35 miles per hour.

Question 13.75

crash

75. The variable head_inj contains a measure of the severity of the head injury sustained by the dummies. The variable chest_in is a measure of the severity of the chest injury suffered by the crash dummies.

  1. Would you expect a linear relationship to exist between the severity of head injuries and chest injuries?
  2. Construct a scatterplot of the head_inj against chest_in. Describe the relationship between the variables.
  3. If we were to perform a regression analysis using these two variables, is it clear which of the two variables we should label as the predictor and which we should label as the response? Explain.

13.1.75

(a) No (b) Positive relationship (c) Unclear