Chapter 7, Problem 6P

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8th Edition

Frederick J Gravetter + 1 other

ISBN: 9781133956570

Textbook Problem

For a population with a standard deviation of σ = 20, how large a sample is necessary to have a standard error that is:

**a.** less than or equal to 5 points?

**b.** less than or equal to 2 points?

**c.** less than or equal to 1 point?

**(a)**

To determine

**To find:** The sample size.

Explanation

**Given info:**

The sample is selected from a population with a standard deviation of

The standard error is

**Calculation:**

*Assuming*
*:*

*Sample size:*

Substitute the value 20 for

**(b)**

To determine

**To find:** The sample size.

**(c)**

To determine

**To find:** The sample size.

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