=+47. Automotive safety. The National Highway Transportation Safety Administration runs crash tests in which stock automobiles are crashed into a wall at 35 mph with dummies in both the passenger and the driver’s seats. The THOR Alpha crash dummy is capable of recording 134 channels of data on the impact of the crash at various sites on the dummy. In this test, 335 cars are crashed. The response variable is a measure of head injury. Researchers want to know whether the seat the dummy is sitting in affects head injury severity, as well as whether the type of car affects severity. Here are boxplots for the 2 different Seats (driver, passenger) and the 6 different Size classifications (compact, light, medium, mini, pickup, van).

3.25 2.75 3.00 2.50