CRIM 320 Chapter Notes - Chapter 5: Frequency Distribution, Bar Chart, Unimodality
17 Sep 2019
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In mathematical terms, probability (p) varies from 0 to 1, although sometimes a percentage rather than decimal is used to express level of probability. Zero probability - implies something is impossible. Probabilities near zero - imply very unlikely occurrences. Probability of 1. 0 constitutes certainty & high probabilities such as . 90, . 95. Probability - relative frequency of occurrence of event/outcome. Number of times any given event could occur out of 100, converted to decimal value b/w 0 and 1. Converse rule - probability of event not occurring equals one minus probability that it will occur. Addition rule - probability of obtaining any one of several outcomes equals sum of separate probabilities. Probability that either event a or event b occurs. P(a or b) = p(a) + p(b) Addition rule always assumes that outcomes being considered are mutually exclusive. Multiplication rule - probability of obtaining combination of independent outcomes equals product of separate probabilities.
