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Unit 1 Lessons 1-4

Simple Probability Vocabulary

TermDefinition
Outcome A result of a probability experiment.
Probability the chance of something occurring.
Sample Space The set of all possible outcomes.
Simple Event one event or action
Impossible A probability of 0
Certain A probability of 1
Equally likely as not A probability of 1/2
Likely A probability between 1/2 and 1
Unlikely A probability between 0 and 1/2
experiment Something you can do over and over again, and you don’t know what will happen each time.
Complementary Events Two events in which either one of the other must happen, but they cannot happen at the same time.
Event The desired outcome or set of outcomes in a probability experiment.
Experimental Probability An estimated probability based on the relative frequency of positive outcomes during an experiment. It is based on what ACTUALLY occurred during such an experiment.
Theoretical Probability The ratio of the number of ways an event can occur to the number of possible outcomes in the sample space. It is based on what SHOULD happen when conducting a probability experiment.
Likelihood The chance of an event happening.
Relative Frequency A ratio that compares the frequency of each category to the total.
Relative Frequency Bar Graph A bar graph showing the relative frequency of an experiment.
Relative Frequency Table A list of the relative frequencies in an experiment.
Uniform Probability Model A probability model which assigns equal probability to all outcomes.
Created by: kgierman
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