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Crash tests on new cars (cont’d). Refer to Exercise 2.149.
Chapter , Problem 150SE(choose chapter or problem)
Problem 150SE
Crash tests on new cars (cont’d). Refer to Exercise 2.149. One quantitative variable recorded by the NHTSA is driver’s severity of head injury (measured on a scale from 0 to 1,500). The mean and standard deviation for the 98 driver head injury ratings are displayed in the Minitab printout below.
a. Give a practical interpretation of the mean.
b. Use the mean and standard deviation to make a statement about where most of the head-injury ratings fall.
c. Find the z-score for a driver head-injury rating of 408. Interpret the result.
Questions & Answers
QUESTION:
Problem 150SE
Crash tests on new cars (cont’d). Refer to Exercise 2.149. One quantitative variable recorded by the NHTSA is driver’s severity of head injury (measured on a scale from 0 to 1,500). The mean and standard deviation for the 98 driver head injury ratings are displayed in the Minitab printout below.
a. Give a practical interpretation of the mean.
b. Use the mean and standard deviation to make a statement about where most of the head-injury ratings fall.
c. Find the z-score for a driver head-injury rating of 408. Interpret the result.
ANSWER:
Problem 150SE
Crash tests on new cars (cont’d). Refer to Exercise 2.149. One quantitative variable recorded by the NHTSA is driver’s severity of head injury (measured on a scale from 0 to 1,500). The mean and standard deviation for the 98 driver head injury ratings are displayed in the Minitab printout below.
a. Give a practical interpretation of the mean.
b. Use the mean and standard deviation to make a statement about where most of the head-injury ratings fall.
c. Find the z-score for a driver head-injury rating of 408. Interpret the result.
Step-by-step solution
Step 1 of 4
a)
Interpretation of the mean:
The mean indicates the central position of the data. Here, from the given MINITAB output, the mean 603.7 indicates the average driver’s severity of head injury in collision.