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Earn +20 ptsQ: How do you make a decision to z test?
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What is the difference between t test and z test in hypothesis testing?
It depends on the population.Use t-test for a small population, N < 30; otherwiase, apply z-test or when N>=30.
Is a z test or t test used more often?
t test, because the z test requires knowing the population standard deviation and that's rare. The t test embodies an estimate of the standard deviation.
When z test is used?
The term Z-test is often used to refer specifically to the one-sample location test comparing the mean of a set of measurements to a given constant.
Why there is no degrees of freedom in Z test?
so
How do you decide whether to use a z test or a t test when testing a hypothesis about a population mean?
You use a z test when you are testing a hypothesis that is using proportions You use a t test when you are testing a hypothesis that is using means
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