In this free online video program, "students learn to draw sound conclusions about a population from a tiny sample. This program focuses on random sampling and the census as two ways to obtain reliable information about a population. It covers single- and multi-factor experiments and the kinds of questions each can answer, and explores randomized block design through agriculturalists’ efforts to find a better strawberry." This individual video is accessed by scrolling down to the "Individual Program Descriptions - 13. Blocking and Sampling " and click the "VOD" icon at the top-right of the description.