STAT. FOR BEHAVIORAL SCIENCES WEBASSIGN
STAT. FOR BEHAVIORAL SCIENCES WEBASSIGN
3rd Edition
ISBN: 9781544317823
Author: PRIVITERA
Publisher: Sage Publications
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Chapter 9, Problem 1FP
To determine

Find the test that is used as an alternative for z test when the population variance is unknown.

Expert Solution & Answer
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Answer to Problem 1FP

The t test is used as an alternative for z test when the population variance is unknown.

Explanation of Solution

Justification: The ttest is similar to the ztest. In ttest sample variance is replaced with population variance for estimating the standard error. When the population standard deviation is not known t test is used in place of z test.

Hence, the t test is used as an alternative for z test when the population variance is unknown.

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