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Essentials of Statistics for the B...

8th Edition
Frederick J Gravetter + 1 other
ISBN: 9781133956570

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Section
BuyFindarrow_forward

Essentials of Statistics for the B...

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 σ=20.

The standard error is σM5.

Calculation:

Assuming σM=5:

Sample size:

n=(σσM)2

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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