The data file CarCrashDummies contains data on automobile crash test results. The explanatory variable is the number of doors on the vehicle, and the response variable is a measurement of the extent of injury on the dummy’s head.
a. Produce graphical displays of the head injury measurements by the number of doors. Describe the distributions, paying particular attention to the question of whether the head injury measurements appear to diff er significantly among the three groups.
b. Does it appear that the validity conditions of the ANOVA procedure and F-test are satisfied with these data? Explain.

c. Perform a simulation-based analysis of these data. Report the p-value and summarize your conclusion.