Asked by Tracy

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

Answers

Answered by 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.
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