A Major Car Manufacturer Wants to Test a New Catalytic $\alpha$

Multiple Choice

A major car manufacturer wants to test a new catalytic converter to determine whether it meets new air pollution standards.The mean emission of all converters of this type must be less than 20 parts per million of carbon.Ten (10) converters are manufactured for testing purposes and their emission levels are measured with a mean of 17.17 and a standard deviation of 2.98.What is the critical value for $\alpha$ = .01 to test the hypotheses.

A) -2.821
B) -3.250
C) -2.33
D) 2.821
E) 3.250