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Explain why using the t statistic may be an appropriate alternative to using a z-score
12 years ago

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MathGuru
Usually you use z-tests when sample sizes are large (n is greater than
or equal to 30) whether or not you know the population standard deviation.

If you do not know the population standard deviation and have a small
sample (n < 30), then you can use t-tests.
12 years ago

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