HYPOTHESIS TESTING PACKAGE SYMBOL

# MeanDifferenceCI

gives a confidence interval for the difference between the population means estimated from and .

## DetailsDetails

• To use , you first need to load the Hypothesis Testing Package using Needs["HypothesisTesting`"].
• gives a confidence interval centered at Mean[list1]-Mean[list2].
• is based on a normal distribution if the population variances are assumed known.
• If the variances for the two populations are assumed equal and unknown, the interval is based on Student's distribution with Length[list1]+Length[list2]-2 degrees of freedom.
• If the population variances are not assumed known and not assumed equal, Welch's approximation for the degrees of freedom is used.
• The following options can be given:
•  ConfidenceLevel 0.95 probability associated with a confidence interval EqualVariances False whether the unknown population variances are assumed equal KnownVariance None list of variances of each population

## ExamplesExamplesopen allclose all

### Basic Examples (1)Basic Examples (1)

The 95% confidence interval for the difference in two population means:

 Out[2]=

## TutorialsTutorials

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