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in 2006, the general social survey asked, in the past 12 months, have you experienced back pain? for this question, 475 people said that

in 2006, the general social survey asked, " in the past 12 months, have you experienced back pain?" for this question, 475 people said that they did out 1723 randomly selected people. what is the 95% confidence interval for the proportion of all Americans that have experienced back pains in the past 12 months?

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