11_Probability_Sp08_BB_nocolor

11_Probability_Sp08_BB_nocolor - Probability Probability...

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1 Probability Probability Readings • Pages 135-140 in your book • Online text book: http://davidmlane.com/hyperstat/probability.html Probability • The likelihood of an event occurring expressed as the ratio of the number of actual occurrences to the number of possible occurrences. Probability • Event = basic data point/outcome on a single trial – e.g., rolling a 4 on a die • The study of probability mostly concerns itself with frequency related probability
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2 Probability • The probability of picking a red marble is 5 out of 7, or 5/7. • The probability of picking a blue marble is 2 out of 7 • The probability of picking a red marble or a blue marble is 7 out of 7 5 Red Marbles 2 Blue Marbles Probability • Events we’ll consider are: – Independent: • when the occurrence or nonoccurrence of one event has no effect on the occurrence or nonoccurrence of the other event. – Mutually exclusive: • if the occurrence of one event precludes the occurrence of the other event.
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This note was uploaded on 04/07/2008 for the course PSY 031 taught by Professor Dicorcia during the Spring '08 term at Tufts.

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11_Probability_Sp08_BB_nocolor - Probability Probability...

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