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A national organization conducted a survey of 1100 American adults and asked how many hours they work each week, on average. The organization reported that

A national organization conducted a survey of 1100 American adults and asked how many hours they work each week, on average. The organization reported that American adults work a mean of 40.5 hours each week. The study reported a margin of error of 0.7 hours. (Assume 95% confidence was used.) Step 1 of 3 : Calculate the lower and upper endpoints of the confidence interval. Do not round answers

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