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# Probability

### Experimental Probability

TermDefinition
Certain Will always happen.
Compound Events An event made up of two or more simple events.
Dependent Event An event which does affect the outcome of another event.
Equally likely outcome Outcomes for an event that have the same chance of occurring.
Even Chance Equal chance of occurring or not occurring.
Event One outcome or a collection of outcomes in the sample space of an experiment.
Experiment An activity or process where the result is unknown.
Impossible Will never happen.
Independent Event An event which does not affect the outcome of another event.
Outcome A result of an experiment.
Probability The calculated chance of something happening.
Random To choose so that the outcome is likely to happen.
Relative frequency The frequency of an event divided by the total number of frequencies.
Sample Space The list of possible outcomes.
Theoretical Probability The probability of an event that is determined by considering the possible outcomes.
Tree Diagram A diagram that uses branches to illustrate all possible outcomes of an experiment.
Two Way Table A table that presents data in rows and columns.
Venn Diagram A diagram for representing sets.
Very Likely Will usually happen.
Very Unlikely Usually won't happen.
theoretical probability ratio of the number of ways in which an event can occur to the total number of equally likely outcomes
experimental probability ratio of the number of times the event occurs to the number of trials
You flip a coin 100 times and it lands on heads 53 times. Probability for flipping heads. 53/100
You flip a coin 100 times and it lands on heads 53 times. Probability for NOT flipping heads. 47/100
You flip a coin 100 times and it lands on heads 53 times. Probability for flipping tails. 47/100
You flip a coin 100 times and it lands on heads 53 times. Probability for NOT flipping tails. 53/100
You have a group of 2 baseballs and 6 footballs. Probability for selecting a football. 3/4
You have a group of 2 baseballs and 6 footballs. Probability for selecting a baseball. 1/4