PSY-0031 Chapter 9: Chapter 9 Textbook Notes
15 Feb 2017
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Binomial distribution - probability distribution that results when the following five conditions are met: On each trial, there are only two possible outcomes. On each trial, the two possible outcomes are mutually exclusive. There is independence between the outcomes of each trial, and. The probability of each possible outcome on any trial stays the same from trial to trial. When all of these 5 conditions are met, the binomial distribution tells us each possible outcome of the n trials and the probability of getting each of these outcomes. Example: flipping two unbiased pennies and finding the probability of getting 2h, 2t, or. P = probability of one of the two possible outcomes of a trial. Q = probability of the other possible outcome. Table b, appendix d: image copied from wikipedia. Limitation - when n gets large, the table becomes huge. Normal approximation approach - way to solve binomial problems using z-scores and the normal curve.
