"Excel is the widely used statistical package, which serves as a tool to understand statistical concepts and computation to check your hand-worked calculation in solving your homework problems. The site provides an introduction to understand the basics of and working with the Excel. Redoing the illustrated numerical examples in this site will help improving your familiarity and as a result increase the effectiveness and efficiency of your process in statistics."
Dr. Hossein Arsham
The site is very clearly written. While some of the concepts are advanced, Dr. Arsham explains them in simple terms. It is a good introduction to the Analysis ToolPak.
Here are some of the subjects covered:
Confidence Interval for the Mean
Test of Hypothesis Concerning the Population Mean
Difference Between Mean of Two Populations
ANOVA: Analysis of Variances
Goodness-of-Fit Test for Discrete Random Variables
Test of Independence: Contingency Tables
Test Hypothesis Concerning the Variance of Two Populations