Studies show that massage therapy has a variety of health benefits and it is not too expensive. A sample of 12 typical one-hour massage therapy sessions showed an average charge of $60. The population...

Studies show that massage therapy has a variety of health benefits and it is not too expensive. A sample of  12 typical one-hour massage therapy sessions showed an average charge of $60. The population standard deviation for a one-hour session is o $5.2.

b.
Using  90% confidence, what is the margin of error (to 2 decimals)?

c.
Using  99% confidence, what is the margin of error (to 2 decimals)?