Add discussion on statistical versus practical significance to hypothesis testing and/or tests for 2-sample data

[charlesfrye]

This was a key point in discussions last year and should be included in the material -- ideally both tutorial and lab material.

[charlesfrye]

Add to hypothesis testing lab -- in the section on effect sizes?

[charlesfrye]

No good place in hypothesis testing lab -- the test is actually too simple to detect different effect sizes!

Perhaps it could be added to the 2-sample lab, at the end of the non-parametric section. Compare two very similar distributions (e.g Gaussians with very small differences in variance) with Wilcoxon?