10.16

The average mpg usage for a 2004 Ford Expedition 2WD for a sample of 10 tanks of gas was 17.0 with a standard deviation of 0.8. For a Ford Explorer 2WD, the average mpg usage for a sample of 10 tanks of gas was 18.5 with a standard deviation of 1.0.

(a) Assuming equal variances, at α = .01, is the true mean mpg lower for the Ford Expedition?

11.2

One particular morning, the length of time spent in the examination rooms is recorded for each

patient seen by each physician at an orthopedic clinic. Does the data prove a significant difference in mean times?

Physician 1

Physician 2

Physician 3

Physician 4

34

33

17

28

25

35

30

33

27

31

30

31

31

31

26

27

26

42

32

32

34

33

28

33

21

26

40

29



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