1. The appropriate null hypothesis, , for the study would

1. The appropriate null hypothesis, , for the study would be:

a. At least one pair of the µ’s (for the trucks) is different

b. μI = μII = μIII = μIV = μV

c. All the pairs of the µ’s (for the trucks) are different

d. μA = μB = μC = μD = μE

2. How many different truck “pairwise” comparisons are there?

a. 15

b. 10

c. 6

d. 5

3. Using a level of significance = 0.05, should any of the truck pairwise comparisons be considered significantly different?

a. No

b. Yes

4. Should the mean direct cost per mile for Truck III be considered significantly different from Truck V?

a. No

b. Yes

5. Do any of the trucks appear to be the best?

a. Yes – Truck I

b. Yes – Truck IV

c. Yes – Truck III

d. Yes – Truck II

e. No – no one truck appears to be the best