Question

Exhibit 10-9
Two major automobile manufacturers have produced compact cars with the same size engines. We are interested in determining whether or not there is a significant difference in the MPG (miles per gallon) of the two brands of automobiles. A random sample of eight cars from each manufacturer is selected, and eight drivers are selected to drive each automobile for a specified distance. The following data show the results of the test.
DriverManufacturer AManufacturer B
13228
22722
32627
42624
52524
62925
73128
82527
Refer to Exhibit 10-9. The mean for the differences is
a. 0.50
b. 1.5
c. 2.0
d. 2.5

Answer

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