1 8. sive (The Wall Street Journal, March 13, 2012). A sample of 10 typical one-hour massage therapy sessions showed an average charge of $59. The population standard deviation for Studies show that massage therapy has a variety of health benefits and it is not too expen- 1. a one-hour session is o = $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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