In this paper, we use a simple experiment for teaching didactically the fundamental concepts of hypothesis testing such as level of significance, rejection region, type II error, power and sample size. The experiment is simply the tossing of a coin several times, but before we toss the coin we set up the statistical hypothesis that the coin is fair, i.e., probability of head = 0.5, and will either reject or no reject that hypothesis depending upon the results of these n tosses. This teaching material is designed for utilizing the computer and used within the context of an introductory statistics course for students in diverse areas of knowledge.

APOS theory, hypothesis testing, type I error, power, sample size.