A nonprofit consumer organization says that the standard deviation of the fuel economies of its top-rated vehicles for a recent year is no more than 9.5 miles per gallon.

(a) State the null and alternative hypotheses and identify which represents the claim, 

(b) Describe type I and type II errors for a hypothesis test of the claim, 

(c) Explain whether the hypothesis test is left-tailed, right-tailed, or two-tailed,

(d) Explain how you should interpret a decision that rejects the null hypothesis, and

(e) Explain how you should interpret a decision that fails to reject the null hypothesis.