COMM 215 Chapter Notes - Chapter 3: Conditional Probability, Contingency Table, Sample Space
7 Apr 2017
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)t(cid:495)s a number that measures the chance or the li elihood that an event will occur. )t(cid:495)s always a number between (cid:882) and (cid:883). The closer an event(cid:495)s probability is to (cid:883), the more li ely it is to happen. : you believe the probability that your favorite hoc ey team will win next game is (cid:882). (cid:891)(cid:887) = you(cid:495)re almost sure they(cid:495)re going to win. For statistical studies, we sometimes collect data by performing a controlled experiment. As an example, we might vary the operating conditions of a manufacturing plant on purpose to study the effects of these changes on the process output. Sometimes we collect data by observing uncontrolled events (ex. An experiment is any process of observation that has an uncertain outcome. The experimental outcomes are the possible outcomes for an experiment. We often want to assign probabilities to experimental outcomes. Probabilities have to be assigned to the experimental outcomes so that two conditions are met:
