Analyse-It for Microsoft Excel: General Statistics Module v1.32 Description:
is an Excel add-in that provides powerful yet easy-to-use statistical analysis. It includes 14 parametric and 17 non-parametric procedures for descriptive statistics, testing normality, group comparisons, correlation, and regression.
More advanced features include confidence intervals for almost all statistics, one and two-sided hypothesis testing, exact p-values for small sample sizes, correction for ties, and more.
Analyse-It includes step-by-step tutorials, and online help which explains the purpose of each test, when it can be used, and what it tells you.