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Author Question: A random sample of 33 pitches from a pitching machine set to throw at 80 mph yields an average speed ... (Read 689 times)

dongbo

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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:

◦

2.634.


◦

2.750.


◦

4.747.


◦

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?

◦

(78.255, 80.245)


◦

(78.493, 80.007)


◦

(78.351, 80.149)


◦

(78.477, 80.023)

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Marked as best answer by dongbo on Feb 26, 2023

KAyteeBee1129

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Reply #1 on: Feb 26, 2023
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dongbo

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Reply 2 on: Feb 26, 2023
YES! Correct, THANKS for helping me on my review

bblaney

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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