Author Question: A random sample of 33 pitches from a pitching machine set to throw at 80 mph yields an average speed ... (Read 687 times)

dongbo · **on:** Feb 26, 2023

Question 1

A random sample of 20 observations is selected from a normally distributed population. The sample variance is 12. In the 95% confidence interval for the population standard deviation, the upper limit will be:

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2.634.

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2.750.

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4.747.

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5.060.

Question 2

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)

KAyteeBee1129 · **Reply #1 on:** Feb 26, 2023

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