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Probability Vocabulary

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Term
Definition
Outcome   A possible result of a situation or experiment.  
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Event   One or more outcomes together  
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Sample Space   The set of all possible outcomes  
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Experimental Probability   The likelihood of an event occurring based on the results of an experiment.  
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Theoretical Probability   The likelihood of an event occurring based only on the situation, not on the results of an experiment.  
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Complement of an Event   All possible outcomes that are not part of an event.  
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Frequency Table   A data display that shows how often an item appears in a category.  
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Relative Frequency   The ratio of a frequency over the total frequency.  
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Set   A collection of elements where order doesn't matter.  
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Subset   If all elements of set A are in set B, then set A is called this.  
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Venn Diagram   A visual representation of sets and subsets  
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Two-way Frequency Table   This displays data in two different sets of categories.  
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Conditional Probability   The likelihood that an event will occur, given that another event has already occurred.  
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Union   This includes all elements in one set or the other.  
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Intersection   This includes only the elements in common between one set and another.  
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Compound Event   An event that is made up of two or more events.  
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Independent Events   Events that do not affect how each other occurs.  
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Dependent Events   Events where one affects how the other occurs.  
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Mutually Exclusive Events   Events that cannot happen at the same time.  
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Overlapping Events   Events that can happen at the same time.  
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Tree Diagram   A diagram that has a branching structure resembling a tree.  
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Permutation   A selection of items where order matters.  
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Combination   A selection of items where order doesn't matter.  
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Geometric Probability   The likelihood that a random point will be on a segment or region in a plane.  
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