PSY-0031 Lecture 7: Binomial Probability
15 Feb 2017
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Binomial trial - a defined experiment with two possible outcomes. One flip of a fair coin: heads = s, tails = f. 0 heads = . 5, 1 head = . 5. Discrete probability density - probability of each outcome is on the y-axis. Cumulative probability - add up all the bars to the left to get the next bar. Two flips of a fair coin: heads = s, tails = f. 0 heads = . 5 x . 5 = . 25. 1 head = (. 5 x . 5) + (. 5 x . 5) = . 5. 2 heads = . 5 x . 5 = . 25. Three flips of a fair coin - same deal as before. To find the binomial likelihood of s successes in s + f trials, we need to know: = p(s) on any one given trial. Probability of a success on any one given trial.
