This is my attempt to explain 2-Sided Hypothesis Testing by answering a Leaving Cert question. You can try it on my Wakari page by clicking here. If you decide to download and run it you can go to 'Cell' followed by 'Run All'. Then if you change any values you can use CTRL + ALT to run an individual cell.
Here is where you can change the variables* for the question. What is even cooler are the local variables, explained after the jump.
* I know confidence interval isn't the right term
