unusual event
an event that has a low probability of occurring
Equally likely outcomes
Outcomes that have the same probability
tree diagram
a list of all the possible outcomes in a diagram with branches that look like a tree
subjective probability
probability obtained on the basis of personal judgement
certainty
the probability of the event is 1
impossible event
the probability of the event is 0
probability model
lists the possible outcomes of a probability experiment and each outcome's probability
event
any collection of outcomes from a probability experiment
Sample space
the set of all possible outcomes of a probability experiment
experiment
process with uncertain results that can be repeated
Law of Large Numbers
As the number of repetitions of a probability experiment increases, the proportion with which a certain outcome is observed gets closer to the probability of the outcome
outcome
experiments that yield long-term results
Probability
experiments that yield random short-term results or outcomes yet reveal long-term predictability