A simple random sample of 45 items resulted in a sample mean of 24. The population standard deviation is 5. (a) What is the standard error of the mean? (b) At a 90% probability,what is the margin of error? (c) Provide a 95% confidence interval for the population mean.

A simple random sample of 45 items resulted in a sample mean of 24. The population standard deviation is 5. (a) What is the standard error of the mean? (b) At a 90% probability,what is the margin of error? (c) Provide a 95% confidence interval for the population mean.

A First Course in Probability (10th Edition)

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Author:Sheldon Ross

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Chapter1: Combinatorial Analysis

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S8.1. A simple random sample of 45 items resulted in a sample mean of 24. The population standard deviation is 5.

(a) What is the standard error of the mean?

(b) At a 90% probability,what is the margin of error?

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