Question: studies show that massage therapy has a variety of health...

Studies show that massage therapy has a variety of health benefits and it is not too expensive. A sample of  typical one-hour massage therapy sessions showed an average charge of . The population standard deviation for a one-hour session is .

a. What assumptions about the population should we be willing to make if a margin of error is desired?

b. Using  confidence, what is the margin of error (to 2 decimals)?

c. Using  confidence, what is the margin of error (to 2 decimals)?