# Probability Terms

• Combination- the way of selecting several things out of a group, where order does not matter.
• Complement- the complement of a set refers to things outside of the set.
• Compound Events- the probabilistic outcomes from two or more events.
• Counting Principle- a simple way to calculate possible outcomes regardless of how many choices there are.
• Event-  Any possible outcome of an experiment in probability.
• Experimental Probability-  The ratio of the number of times an outcome occurs to the total amount of trials performed.
• Factorial- The expression n! is a symbol to indicate the product of all counting numbers beginning with n and counting backwards to 1.
• Independent Events-  Events whose outcomes do not influence each other.
• Intersection- The set of all elements contained in all of the given sets.
• Line of Best Fit- The line that best represents the trend that the points in a scatter plot follow.
• Outcome –  A possible result of an experiment.
• Permutation- the rearranging of objects in an ordered fashion.
• Probability- A measure of the likelihood of an event.
• Random Sample- A sample chosen from a population such that each data unit in the population has an equal chance of being chosen each time.
• Sample Space- the set of all possible outcomes from an experiment.
• Scatter Plot- The graph of a collection of ordered pairs that allows an exploration of the relationship between the points.
• Set-  A collection of numbers that have some characteristic in common.
• Simulation- An experiment that models a real-life situation.
• Theoretical Probability- The mathematical calculation that an event will happen in theory.
• Tree Diagram-  A diagram that shows all the possible outcomes of an event.
• Union-  The set of all elements that belong to at least one of the given two or more sets.
• Venn Diagram- A picture that illustrates the relationship between two or more sets.

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