Refer to the NHTSA crash test data for new cars. In Exercise 4.102, you assumed that the driver's head-injury rating is approximately normally distributed. Apply the methods of this chapter to the data saved in the accompanying file to support this assumption.
Exercise 4.102
Refer to Exercise 4.21 and the NHTSA crash test data for new cars. One of the CRASH variables saved in the accompanying file is the severity of a driver's head injury when the car is in a head-on collision with a fixed barrier while traveling at 35 miles per hour. The more points assigned to the head-injury rating, the more severe the injury. The head-injury ratings can be shown to be approximately normally distributed with a mean of 605 points and a standard deviation of 185 points. One of the crash-tested cars is randomly selected from the data, and the driver's head-injury rating is observed.