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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 76 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
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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Darron12

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Reply 2 on: Mar 25, 2023
Gracias!

Viet Thy

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Reply 3 on: Yesterday
Wow, this really help

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