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t-test of mean

The manufacturer of the Ososki motorcycle advertises that the cycle will average 87 miles per gallon of gasoline. A sample of eight bikes revealed the following mileage:

88, 82, 81, 87, 80, 78, 79, 89

At the .05 level, is the mean mileage less than the advertised 87 miles per gallon?

Solution Preview

The manufacturer of the Ososki motorcycle advertises that the cycle will average 87 miles per gallon of gasoline. A sample of eight bikes revealed the following mileage:

88, 82, 81, 87, 80, 78, 79, ...

Solution Summary

To test if the mean mileage less than the advertised 87 miles per gallon.

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