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 13.78

crash

78. Perform a regression of the left leg injury severity on the vehicle weight .

  1. What is the regression equation? Write it out in words and numbers, so that a nonstatistician would understand it.
  2. Is the relationship significant? Perform the appropriate hypothesis test, using level of significance .
  3. Construct and interpret a 95% confidence interval for the true slope of the relationship between vehicle weight and severity of left leg injury. How does your confidence interval support your conclusion in (b)?