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Statistics / Elementary Statistics: A Step by Step Approach 8th ed. 8 / Chapter 7-1 / Problem 14

Elementary Statistics: A Step by Step Approach 8th ed. | 8th Edition | ISBN: 9780073386102 | Authors: Allan G Bluman Professor Emeritus

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Number of Jobs A sociologist found that in a sample of 50

Chapter 7, Problem 14

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QUESTION:

Number of Jobs A sociologist found that in a 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 mean. 7.2 jobs b. Find the 95% confidence interval of the mean number of jobs. 6.6 _ m _ 7.8 c. Find the 99% confidence interval of the mean number of jobs. 6.4 _ m _ 8.0 d. Which is smaller? Explain why.

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QUESTION:

Number of Jobs A sociologist found that in a 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 mean. 7.2 jobs b. Find the 95% confidence interval of the mean number of jobs. 6.6 _ m _ 7.8 c. Find the 99% confidence interval of the mean number of jobs. 6.4 _ m _ 8.0 d. Which is smaller? Explain why.

ANSWER:

Step 1 of 5

Given Information

Following information is given:

Number of samples:

Average number of jobs:

Population standard deviation:

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