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Probability concepts

3.13 NCEA level 3 statistics

QuestionAnswer
P(A) meaning? The probability that event A happens
P(A') meaning? The probability that event A doesn't happen
P(AnB) meaning? The probability that event A and event B both occur
P(AUB) meaning? The probability that event A or event B occurs
P(B l A) meaning? The probability that event B occurs given that event A occurs
What is long run relative frequency? This means repeating an experiment over and over again so we can identify the pattern that occurs.
What is experimental probability ? The probability of an event occurring based on an actual experiment
What is theoretical probability? The probability of an event occurring based on math theory
What is true probability? Often unknown due to other factors
What is conditional probability? The probability that one event happens given that another event has occurred.
What is the simplified version of X & Y independence equation? Var(X+Y)=Var(X)+Var(Y)
How do we calculate P(AUB)? =P(A)+P(B)-P(AnB)
What are the two equations for mutually exclusive? P(AUB)=P(A) + P(B) P(A n B) = 0
What is the independence equation? P(A n B) = P(A) x P(B)
Created by: estherbruce
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