Attributed to Napoleon Bonaparte is the quote, “A picture worth a thousand words.” The Family Circus snippet below provides a very good example of correlation not equaling causation. Anyone who has flown, clearly knows that the seatbelt sign is not the cause of in-flight turbulence. Their certainly is a correlation, because the light is turned on whenever it gets bumpy. The litmus test for causation? Remove the light and see if it eliminates the turbulence.
http://www.oxfamblogs.org/fp2p/wp-content/uploads/causation-v-correlation-cartoon.gif
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