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# Stats Ch 12

TermDefinition
Random Phenomena When we know the possible outcomes, but not which particular values will happen.
Law of Large Numbers Long-run relative frequency of repeated independent events gets closer to the true relative frequency as the number of trials increases.
Theoretical Probability Using knowledge about a situation, some logical reasoning, and/or known formula to model the probability of an event happening.
Empirical Probability The ratio of the number of times A occurs to the total number of trials.
Independent Events where the outcome of one trial does not affect the outcome of other trials.
Trial A single attempt or realization of a random phenomenon.
Outcome The result of a single trial.
Event The set of outcomes to which a probability is assigned.
Sample Space The collection of all possible outcomes.
Fundamental Counting Theorem If event A has m outcomes and independent event B has n outcomes, then A or B = m + n and A and B = mn.
Equally Likely Condition The outcomes in a sample space, whether listed or counted, are all equally likely to occur.
Permutation The number of ways to arrange any r items from a group of n different items calculated by n!/(n-r)!.
Combination The number of ways to select any r items from a group of n different items calculated by n!/(r!(n-r)!).
Created by: HowardGeometry
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