These are slides for a talk that I gave to AP statistics students at Madison East High School on 9 March 2017, and then to Biomedical Data Science summer undergraduate researchers at UW-Madison on 26 July 2017. (They are revised from a talk I gave at the Complex Trait Community 13th annual meeting in Berlin, Germany, on 21 May 2014.)
Slides and interactive graphs online at bit.ly/BDS2017-07.