Crash tests on new cars. NHTSA crash test data. One quantitative variable recorded by the...

Crash tests on new cars. NHTSA crash test data. One quantitative variable recorded by the NHTSA is driver’s severity of head injury (measured on a scale from 0 to 1,500). Numerical descriptive statistics for the 98 driver head-injury ratings in the CRASH file are displayed in the MINITAB printout at the bottom of the page.

a. Interpret each of the statistics shown on the printout.

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b. Find the z -score for a driver head-injury rating of 408. Interpret the result.

Crash tests on new cars. Each year, the National Highway Traffic Safety Administration (NHTSA) crash tests new car models to determine how well they protect the driver and front-seat passenger in a head-on collision. The NHTSA has developed a “star” scoring system for the frontal crash test, with results ranging from one star (*) to five stars (*****). The more stars in the rating, the better the level of crash protection in a head-on collision. The NHTSA crash test results for 98 cars in a recent model year are stored in the data file named CRASH. The driver-side star ratings for the 98 cars are summarized in the MINITAB printout below. Use the information in the printout to form a pie chart. Interpret the graph.