Cautions about Sample Surveys, Causes of Bias, and Inference defined

I finish my three part introduction of Sample Surveys. In this lecture I define Undercoverage, Non-Response, discuss causes of Biased Results, define Inference, and preview Sample Distributions. Find free review test, useful notes and more at http://www.mathplane.com/ If you'd like to make a donation to support my efforts look for the "Tip the Teacher" button on my channel's homepage    / profrobbob