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Variability is a fundamental concept in statistics. This tutorial covers the standard deviation and why measuring variability is so important. Fundamentals of Statistics 1: Basic Concepts If you know nothing about statistics, this is the place to start. The tutorial covers basic concepts such as the mean, standard deviation, populations and sample statistics. Fundamentals of Statistics 2: The Normal DistributionVisualization tools use a variety of methods to show you where users are clicking on the individual pages of your Web site to help you make design adjustments that emphasize the right links and content. Indextools – Provides web-based analytics package featuring real-time reporting. The Path Explorer feature provides a visual overlay of how users are behaving on your site.

