Learn how biased sampling provides incorrect information. Organization and Planning Procure an inflatable globe for class members to toss from one to another using specific methods of tossing and sampling to obtain biased samples. Objectives Students learn how biased sampling yields incorrect conclusions about a population parameter. Students learn about simple, random samples. Students learn how to assure that samples are representative.
Students learn that randomized, larger, higher-resolution samples yield more accurate results.
Students learn about the value of high-fidelity models Procedures Inflate the globe, then start tossing it to others in the room. As participants catch the ball, they note whether a designated finger falls on water or on land. Now, the objective is to see how they can obtain incorrect values for the ratio by introducing bias into the sampling method. Since spin introduces a random component, to get a biased value, the ball should be tossed without spin. Which finger to use.