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EqualVariances
is an option to statistical confidence interval and hypothesis test functions of two samples that specifies that unknown population variances are equal.
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- To use
, you first need to load the Hypothesis Testing Package using Needs["HypothesisTesting`"]. 
is an option for confidence interval and hypothesis test functions of two lists.- With the default setting EqualVariances->False, variances are estimated from the two samples independently if the variances are not specified as known.
- With EqualVariances->True, a common pooled estimate of the variance is used for both populations if the variances are not specified as known.
