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Two Sample Tests
Two Sample t-test
The StatPlus>Two Sample Tests>2 Sample t-test command performs a two
sample t-test for data values, arranged either in two separate columns or
within a single column alongside a column of category levels. Users can
specify the null and alternative hypotheses as well as the size of the con-
fi dence interval. The test can use either a pooled or an unpooled variance
estimate. The output can be broken down by the levels of a By variable.