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# Statistics

### probabilities ch 4

Probability Experiment Process which leads to well-defined results call outcomes
Outcome The result of a single trial of a probability experiment
Sample Space Set of all possible outcomes of a probability experiment
Event One or more outcomes of a probability experiment
Classical Probability Uses the sample space to determine the numerical probability that an event will happen. Also called theoretical probability.
Equally Likely Events Events which have the same probability of occurring.
Complement of an Event All the events in the sample space except the given events
Empirical Probability Uses a frequency distribution to determine the numerical probability. An empirical probability is a relative frequency.
Subjective Probability Uses probability values based on an educated guess or estimate. It employs opinions and inexact information.
Mutually Exclusive Events Two events which cannot happen at the same time.
Independent Events Two events are independent if the occurrence of one does not affect the probability of the other occurring
Dependent Events Two events are dependent if the first event affects the outcome or occurrence of the second event in a way the probability is changed.
Conditional Probability The probability of an event occurring given that another event has already occurred
Bayes' Theorem A formula which allows one to find the probability that an event occurred as the result of a particular previous event.
Created by: sam6204