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Studies show that message therapy has a variety of health benefits a sample of 10 typical one-hour massage therapy sessions showed an average charge of $59 the population standard deviation for one-hour session is $5.50 a) what assumptions about the population should we be willing to make if a margin of error is desired b) using 95% confidence , what is the margin of error? c) Using 99% confidence, what is the margin of error?

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