Statistics must be scrutinized and put into context. It's always a good idea, when you come across a statistic you want to use, to trace it back to its source. Suppose you find an article in a magazine that says that a certain percentage of teenagers smoked in the 1950s. Somewhere in the article you may be able to find the source of that information, such as "according to the National Institutes of Health." You should always question someone else's interpretation of raw data, meaning that if you really want to use this statistic, you need to go back to the NIH data yourself. Maybe it was X percent of all 17-year-olds who smoked, or maybe it was X percent of 17- and 18-year-olds in Philadelphia. People often misinterpret statistical information, whether intentionally or not. The interpretation may satisfy your story, but don't trust it until you can get it corroborated by someone with sufficient expertise.
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