Two Major Automobile Manufacturers Have Produced Compact Cars with Engines

question 2

Multiple Choice

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. ​ At α = .10, the null hypothesis

• A) should not be rejected.
• B) should be rejected.
• C) should be revised.
• D) should not be tested.

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Definitions:

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A cleaning agent, specifically designed for washing clothes, that helps remove dirt and stains.

External Validity

The degree to which the results of a study can be generalized to other situations, populations, or time periods.

Internal Validity

The degree to which research can show a direct link between variables, unaffected by outside factors.

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