When Is a T-Test Used Instead of a Z-Test

question 17

Multiple Choice

When is a t-test used instead of a z-test?

• A)When the population µ is known
• B)When the population deals with two samples
• C)When the population standard deviation is known
• D)When the population standard deviation is unknown

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Definitions:

Standard Deviation

A measure of the amount of variation or dispersion of a set of values; a low standard deviation indicates that the values tend to be close to the mean of the set.

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A set of rules or guidelines that specifies the expectations for attendance, including consequences of absence at a workplace or educational institution.

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