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A random sample of 33 pitches from a pitching machine set to throw at 80 mph yields an average speed ...

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A random sample of 33 pitches from a pitching machine set to throw at 80 mph yields an average speed ...

A random sample of 33 pitches from a pitching machine set to throw at 80 mph yields an average speed of 79.25 mph. If we know that the standard deviation of speed from this machine is 2.22 mph, what is a 98% confidence interval for the mean pitch speed?

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(78.255, 80.245)

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(78.493, 80.007)

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(78.351, 80.149)

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(78.477, 80.023)

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Introductory Statistics: A Problem-Solving Approach

Edition: 3^rd

Author: Kokoska

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