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Probability concepts
3.13 NCEA level 3 statistics
Question | Answer |
---|---|
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) |