**Two Sample tests: mean, variance and frequency comparisons - in an instant**

**The Two Samples menu gives 8 methods for comparing two-sample data:**

**t-Test - Equal Variance - Balanced**to compare two means when both samples are assumed to have the same variance and both samples have the same number of observations.**t-Test - Equal Variance - Unbalanced**to compare two means when both samples are assumed to have the same variance and the samples have different numbers of observations.**t-Test - Unequal Variance**- If the samples cannot be assumed to have the same variances.**Mann Whitney**- a non-parametric test to determine if there is a significant difference between the medians of two samples.**Compare Variance (F Test)**- to test if the variances of two samples are the same.**Chi-squared**- to test two sets of frequencies for a significant difference.**Paired t-Test**- to compare the means of paired samples.**Wilcoxon Matched Pairs (Signed rank)**- the non-parametric test for difference between matched pairs.

**Simple intuitive setup dialogs mean you can carry out a
two-sample analysis in seconds.
When the analysis is done, Expand & Explore take you step-by-step
through the entire calculation.
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