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

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Ethics and Statistics—It’s a Dangerous World Out There

People often use statistics when attempting to persuade you to their point of view. Because they are motivated to convince you to purchase something from them or simply to support them, this motivation can lead to the misuse of statistics in several ways.
 
One of the most common misuses is choosing a sample that ensures results consistent with the desired outcome, rather than choosing a sample representative of the population of interest. This is known as having a biased sample.
def•i•ni•tion
A biased sample is a sample that does not represent the intended population and can lead to distorted findings. Biased sampling can occur either intentionally or unintentionally.
Suppose, ...

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