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13th Edition

Anderson

Publisher: CENGAGE L

ISBN: 9781305881884

Chapter 8.1, Problem 2E

Textbook Problem

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A simple random sample of 50 items from a population with σ = 6 resulted in a sample mean of 32.

- a. Provide a 90% confidence interval for the population mean.
- b. Provide a 95% confidence interval for the population mean.
- c. Provide a 99% confidence interval for the population mean.

**a.**

To determine

Find the 90% confidence interval for population mean.

**Calculation:**

The given information is that the sample of 50 items are selected randomly with mean 32 and population standard deviation 6.

The formula of confidence interval for population mean is,

From the “Table 8.1 value of

The value of confidence interval for population mean is

**b.**

To determine

Find the 95% confidence interval for population mean.

**c.**

To determine

Find the 99% confidence interval for population mean.

STATISTICS F/BUSINESS+ECONOMICS-TEXT

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