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Author Question: Exhibit 8-2A random sample of 121 automobiles traveling on an interstate showed an average speed of ... (Read 177 times)

stananza

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on: Mar 25, 2023

Question 1

Exhibit 8-2
A random sample of 121 automobiles traveling on an interstate showed an average speed of 65 mph. From past information, it is known that the standard deviation of the population is 22 mph.


Refer to Exhibit 8-2. The standard error of the mean is


◦

22.00


◦

96.60


◦

4.24


◦

2.00



Question 2

Exhibit 8-2
A random sample of 121 automobiles traveling on an interstate showed an average speed of 65 mph. From past information, it is known that the standard deviation of the population is 22 mph.


Refer to Exhibit 8-2. If the confidence coefficient is reduced to 0.9, the standard error of the mean


◦

will increase


◦

will decrease


◦

remains unchanged


◦

becomes negative

Essentials of Statistics for Business and Economics ¦ Anderson, Sweeney, Williams, Camm, Cochran ¦ 7th Edition
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Marked as best answer by stananza on Mar 25, 2023

Yermi196

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Reply #1 on: Mar 25, 2023
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stananza

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Reply 2 on: Mar 25, 2023
Gracias!

aliotak

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Reply 3 on: Yesterday
YES! Correct, THANKS for helping me on my review

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