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September 1, 2014

September 1, 2014

Posted by **Tracy** on Tuesday, February 5, 2013 at 10:05pm.

- stat -
**MathGuru**, Wednesday, February 6, 2013 at 7:02pmUsually 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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