STAB22H3 Lecture Notes - Lecture 16: Nitrogen Dioxide, Random Assignment
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STAB22H3 Full Course Notes
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When we know what treatment was assigned, it is difficult not to let that knowledge influence our assessment of the response, even when we try to be careful. An observed effect so large that it would rarely occur by chance is called statistically significant. When all experimental units are allocated at random among all treatments, the experimental design is completely randomized. Example: we want to compare three teaching methods a, b, and c. Select a group of students at random, e. g. 30 students. Divide them into three groups at random: one group studying from method a, one from method b, and the other from method c. Assess performance of all students and compare the results. A block is a group of experimental units or subjects that are known before the experiment to be similar in some way that is expected to affect the response to the treatments.
