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Elementary Statistics: A Step By Step Approach | 9th Edition | ISBN: 9780073534985 | Authors: Allan Bluman
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Number of JobsA sociologist found that in a sample of 50

Chapter 7, Problem 12E

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QUESTION:

A sociologist found that in a random sample of 50 retired men, the average number of jobs they had during their lifetimes was 7.2. The population standard deviation is 2.1.

a. Find the best point estimate of the population mean.

b. Find the 95% confidence interval of the mean number of jobs.

c. Find the 99% confidence interval of the mean number of jobs.

d. Which is smaller? Explain why.

Questions & Answers

QUESTION:

A sociologist found that in a random sample of 50 retired men, the average number of jobs they had during their lifetimes was 7.2. The population standard deviation is 2.1.

a. Find the best point estimate of the population mean.

b. Find the 95% confidence interval of the mean number of jobs.

c. Find the 99% confidence interval of the mean number of jobs.

d. Which is smaller? Explain why.

ANSWER:

Step 1 of 5

Given sample size \((n)=50\)

Sample mean \((\bar{x})=7.2\)

Standard deviation \((\sigma)=2.1\)

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