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Unformatted text preview: P(A), is the long run frequency or proportion of times the event occurs. • Probability is always between 0 and 1 • Probability always refers to an event • P(A) = 1 means A will de]initely happen • P(A) = 0 means A will de]initely not happen Statistics: Unlocking the Power of Data Lock5 Probability Examples • Y = number of siblings P(Y = 1) = 0.481 (based on survey data) • Y= ]inal grade in STAT 101 P(Y > 90) = 0.338 (based on previous classes) • For U.S, college students in 2010 P(Gender = female) = 0.585 (World DataBank) • P(it rains today) = ? (www.weather.com) Statistics: Unlocking the Power of Data Lock 5 Equally Likely Outcomes If all possible outcomes are equally likely, the probability o...
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This document was uploaded on 03/03/2014.
 Spring '14

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