is an option to statistical confidence interval and hypothesis test functions that specifies the value of the population variance.
- To use , you first need to load the Hypothesis Testing Package using Needs["HypothesisTesting`"].
- The value of 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 and for the two populations can be given as .