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Author Question: A random sample of 81 credit sales in a department store showed an average sale of $68.00. From past ... (Read 128 times)

Labomba

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on: Mar 25, 2023

Question 1

A random sample of 81 children with working mothers showed that they were absent from school an average of 6 days per term with a standard deviation of 1.8 days. Provide a 95% confidence interval for the average number of days absent per term for all the children.



Question 2

A random sample of 81 credit sales in a department store showed an average sale of $68.00.  From past data, it is known that the standard deviation of the population is $27.00.

a.Determine the standard error of the mean.
b.With a 0.95 probability, what can be said about the size of the margin of error?
c.What is the 95% confidence interval of the population mean?

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

saly

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Reply #1 on: Mar 25, 2023
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Labomba

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Reply 2 on: Mar 25, 2023
YES! Correct, THANKS for helping me on my review

skipfourms123

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Reply 3 on: Yesterday
:D TYSM

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