Just a very short message to direct you to my article on statistical significance over on the Kissmetrics blog. The emphasis is on intuitive means to understanding the key ideas.
Check Out My Guide to Statistical Significance on Kissmetrics
Fun, example-filled guide, aimed at building intuition
Fresh mental models to help with finding the right targeting for your online advertising.
Rich snippets and all the basics about keywords in title tags, URLs, etc.
A High-Level Catalogue of The Main Areas to Fiddle With When Optimizing Your Conversion Rate