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Author Question: A sample of 20 items from a population with an unknown is selected in order to develop an interval ... (Read 72 times)

Darron12

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on: Mar 25, 2023

Question 1

A random sample of 64 students at a university showed an average age of 25 years and a sample standard deviation of 2 years. The 98% confidence interval for the true average age of all students in the university is


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20.5 to 26.5


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24.4 to 25.6


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23.0 to 27.0


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20.0 to 30.0



Question 2

A sample of 20 items from a population with an unknown σ is selected in order to develop an interval estimate of μ. Which of the following is not necessary?


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We must assume the population has a normal distribution.


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We must use a t distribution.


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Sample standard deviation must be used to estimate σ.


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The sample must have a normal distribution.

Essentials of Statistics for Business and Economics ¦ Anderson, Sweeney, Williams, Camm, Cochran ¦ 7th Edition
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Marked as best answer by Darron12 on Mar 25, 2023

sakura282000

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Reply #1 on: Mar 25, 2023
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Darron12

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Reply 2 on: Mar 25, 2023
Wow, this really help

xoxo123

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

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