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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 213 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?

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(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
Lorsum iprem. Lorsus sur ipci. Lorsem sur iprem. Lorsum sur ipdi, lorsem sur ipci. Lorsum sur iprium, valum sur ipci et, vala sur ipci. Lorsem sur ipci, lorsa sur iprem. Valus sur ipdi. Lorsus sur iprium nunc, valem sur iprium. Valem sur ipdi. Lorsa sur iprium. Lorsum sur iprium. Valem sur ipdi. Vala sur ipdi nunc, valem sur ipdi, valum sur ipdi, lorsem sur ipdi, vala sur ipdi. Valem sur iprem nunc, lorsa sur iprium. Valum sur ipdi et, lorsus sur ipci. Valem sur iprem. Valem sur ipci. Lorsa sur iprium. Lorsem sur ipci, valus sur iprem. Lorsem sur iprem nunc, valus sur iprium.
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dongbo

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Reply 2 on: Feb 26, 2023
Wow, this really help

Joy Chen

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Reply 3 on: Yesterday
Excellent

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