Formula Sheet for Test 2

Formula Sheet for Test 2 - Probability Questions Basic...

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Probability Questions Basic Probability - Key Words: Find the probability… “1” randomly selected… - Formula(s): # of times "A" happened ( ) Total # of observations P A = OR # of ways "A" can happened ( ) Total # of possible outcomes P A = Addition Rule - Key Words: Find the probability… “1” randomly selected… “or” - Formula: ( 29 ( 29 ( 29 ( ) P AorB P A P B P A B = + - # of subjects in group A # of subjects in group B # of subjects belonging to both A & B ( ) Total Total Total P AorB = + - Conditional Probability - Key Words: Find the probability… “1” randomly selected… “given that”… - Formula: ( 29 ( 29 ( 29 | P A B P A B P B a = of Subjects in Both Groups/Total of Subjects in Group B/Total Number Number = *short cut: Only look at the numbers in the row or column relating to the “given that” condition, the total of that row or column is your denominator, then just get your numerator. Multiplication Rule
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Formula Sheet for Test 2 - Probability Questions Basic...

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