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The Complete Idiot's Guide to Statistics, 2nd Edition by Robert Donnelly

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What Is Probability?

Probability concepts surround most of our daily lives. When I see that the weather forecast shows an 80 percent chance of rain tomorrow and I want to play golf or that my beloved Pittsburgh Pirates have only won 40 percent of their games this year (which they also did last year and the year before that), there is a 65 percent chance I will get moody.
 
In simple terms, probability is the likelihood of a particular event like rain or winning a ballgame. But before we go any further, we need to tackle some new “stat jargon.” The following terms are widely used when talking about probability:
Experiment. The process of measuring or observing an activity for the purpose of collecting data. An example is rolling a pair ...

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