Two major automobile manufacturers have produced compact cars with engines of the same size. We are interested in determining whether or not there is a significant difference in the mean MPG (miles per gallon) when testing for the fuel efficiency of these 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 (in miles per gallon) show the results of the test. Assume the population of differences is normally distributed.
Driver Manufacturer A Manufacturer B
1. 32 28
2. 27 22
3. 26 27
4. 26 24
5. 25 24
6. 29 25
7. 31 28
8. 25 27
At a. 10, the null hypothesis
a) should not be rejected.
b) should be rejected.
c) should be revised.
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