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PROBABILITY

PROBABILITY. So, you’re saying there’s a chance!. 5.1 Basic Probability. Probability Defined: A Measure of Chance or, the likelihood of an event happening Prob Notation: P (A) Prob of event A “P of A” Prob Found : # of desired results/# of total results f/n 0<= P<=1.

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PROBABILITY

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  1. PROBABILITY So, you’re saying there’s a chance!

  2. 5.1 Basic Probability • Probability Defined: A Measure of Chance or, the likelihood of an event happening • ProbNotation: P(A) Probof event A “P of A” • Prob Found: # of desired results/# of total results f/n • 0<= P<=1

  3. Marbles

  4. Complement • The complement of an event: P(not the event) P(not A). Written as P(A’) • P(A)+P(A’)=1… • So, P(A’)= 1-P(A)

  5. Pizza

  6. Probvs Stat • Stats: the sample is known • We draw conclusions about the population based on the results of our sample. • Prob: the population is known • We ask “what are the chances…what is the likelihood on this try?” we are asking about this sample. • Stats reasons from the sample toward the population • Prob reasons from the population toward the sample

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