Two tailed vs. One tailed in hypothesis testing? 

This video discusses the two tailed and one tailed test, which is used in hypothesis testing (inference studies).
The two tailed test is used when you only need to know if there is a difference between a given population before treatment vs. after treatment.
The one tailed test is used if you want to know if a given population is either greater than, or less than, but not both, for a give population before treatment vs. after treatment.
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