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p of an event is equal to the relative frequency of the event in the population of all possible events that can occur
Probability cannot be less than 0 or greater than 1
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| the proportion of time a score occurs in a distribution, equal to the proportion of the total number of scores that the score's simple frequency represents; symbolized by rel. r |
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| ...that the event will occur in any future sample, express this relative frequency as probability |
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| a mathematical statement indicating the likelihood of an event when a particular population is randomly sampled |
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| the set of all possible outcomes of a probability experiment. it is an exhaustive list of all the possible outcomes of an experiment. each possible result of such as study is represented by one and only one point in the sample space |
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| any collection of outcomes of an experiment. any subset of the sample space is an event |
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| simple or elementary event |
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| any event which consists of a single outcome in the sample space |
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| events which consist of more than one outcome |
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| P(A) = The number of ways event A can occur/The total number of possible outcomes |
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| probability of every possible event in the population, derived from the relative frequency of every possible event in the population |
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| Empirical probability distribution |
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| a posterior- a probability distribution based on observations of the relative frequency of events |
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| Theoretical probability distribution |
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| a priori - We derive a relative distribution based on certain assumptions. Number of outcomes classifiable as event A divided by total number of possible outcomes. Based on theoretical model of the relative frequencies of events in a population |
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| Formula for computing probability |
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Definition
p(event)*=number of outcomes that satisfy event/total number of possible outcomes
*When all outcomes are equally likely to occur |
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