15. The following stem-and-leaf diagram represents a data set (leaf unit = 0.1):

1 | 2 6

2 | 0 3 3 3 4 5 6 6 7

3 | 3 5 5 8

4 | 2 8 8 8 8 8 9 9 9

5 | 1 6

6 | 7

The largest observation in the data set is:

[A] 67[B] 6.7[C] 7.6[D] 76

Questions 16-18. A manufacturer claims that the average gas mileage of a 4-wheel drive truck model is 18.2 miles per gallon. The gas mileages for 57 randomly selected trucks are obtained, and they produced an average of 18.5 miles per gallon with a standard deviation of 1.15. It is of interest to know if the manufacturer's claim is right.

16. The margin of error for estimating the average gas mileage of the 4-wheel drive truck model is:

[A]1.15[B]2.25[C]0.3[D]0.75

17. The p-value for the statistical test used to verify the manufacturer's claim is approximately equal to:[A] 3.94[B] 0.024[C] 0.048 [D] 1.97

18. Is there is enough evidence that the manufacturer's claim is wrong? Use = 0.05.[A] YES[B] NO