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Two-tail Test
A statistical hypothesis test in which the area of interest is on both sides of the distribution, allowing for testing of both extreme high and low results.
Population Means
The average value of a particular characteristic for an entire population.
One-tail Area
Refers to the area under the probability distribution curve to either the left or right of a specified value, used in hypothesis testing to assess one-sided significance.
Equal-variances Test
A statistical procedure used to assess whether the variances of two populations are equal, as assumed by certain parametric tests.
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