Refer to Exercise 5.74.
In exercise

a. Calculate the probability of a Type II error for several values of μc, the average change in mileage. How do these values affect the conclusion you reached in ­Exercise 5.75?
b. Suggest some changes in the way in which this study in Exercise 5.74 was conducted.

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installation. The data are recorded here. Car 12 3 4 5 67 89 10 Before (pg 19.1 29.9 176 20.2 23.5 26.8 21.7 25.7 19.5 28.2 10 2322 4.25 After (mpg) 25.8 237 28.7 25.4 32.8 192 29.6 22.3 25.7 20.1 10 25.33 425 Change (mpg 6.7 -62 111 5.2 9.3-76 7.9-34 6.2 -8.1 10 2.11 754