KnownVariance

is an option to statistical confidence interval and hypothesis test functions that specifies the value of the population variance.

Details and Options

To use KnownVariance, you first need to load the Hypothesis Testing Package using Needs["HypothesisTesting`"].
The value of KnownVariance can be a positive number or None.
For KnownVariance->None, the population variance is estimated from the input data.
For confidence intervals and tests based on two samples, variances var₁ and var₂ for the two populations can be given as KnownVariance->{var₁,var₂}.

A test assuming the population variance is 5:

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