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STAT 200 (34)
Lecture 4

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Department
Statistics
Course
STAT 200
Professor
Andrew Wiesner
Semester
Spring

Description
9/14/10 Week 4 Probability A study was conducted to research gender attitudes of PSU students regarding equal financial No Yes Totals Female 72 466 538 Male 181 158 339 Totals 253 624 877   Three ways of getting a probability: 1. Relative Frequency­ how often an outcome has occurred or has happened over time. (Or  many trials) 2. Subjective­ someone’s personal opinion  3. Classical­ outcomes of interest divided by total possible outcomes Ex. flip a coin: interest in getting a head ½ Outcome of Interest:  1. “Randomly select person is female” 2. “Randomly select person says yes” Exchange wording to replace “outcome” with “event” Probability of event 1 and probability of event 2 Short Hand: use either simple word or letter to define event. Let f equal event randomly selected person is female Let y equal event randomly selected person says yes P (f)= probability of event f occurs P (y)= probability of event y occurs e.x. p(f)= 538/877= 0.6134 Complement of an event is all outcomes not in event of interest. Notation ‘ or c complement to F  written as F’ or F  is event male. c P (F ) = P (F’) = 339/877= 0.3866 P (F ) = 1 – P (F) 0 
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