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Example 128


Example 128: In previous tests, baseballs were dropped 24ft onto a concrete surface, and they bounced an average of 92.84 inches.  In a test of a sample of 28 new balls, the bounce heights had a mean of 92.67 inches and a standard deviation of 1.79 inches.  Use a 5% level of significance to test the claim that the new balls have a mean bounce height different from 92.84.


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