STAT 100 Chapter 18: Chapter 18 STATS.docx

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STAT 100 Full Course Notes
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STAT 100 Full Course Notes
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At random we give every such subject the same chance to be the one we choose. P(not married) = p(never married) + p(widowed) + p(divorced) P(not married) = the probability that the woman we choose is not married. A probability model for a random phenomenon describes all the possible outcomes and says how to assign probabilities to any collection of outcomes (events) A) any probability is a number between 0 and 1. B) all possible outcomes together must have probability 1. C) the probability that an event does not occur is 1 minus the probability that the event does occur. D) if two events have no outcomes in common, the probability that one or the other occurs is the sum of their individual probabilities. Any assignment of probabilities to all individual outcomes that satisfies rules a and b is legitimate (rules c and d are then automatically true) The rules tells us only what probability models make sense.

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