The average annual miles driven per vehicle in the United States is 11.1 thousand miles, with600 miles. Suppose that a random sample of41vehicles owned by residents of Chicago showed that the average mileage driven last year was10.9thousand miles. Does this indicate that the average miles driven per vehicle in Chicago is different from (higher or lower than) the national average? Use a 0.05 level of significance. What are we testing in this problem?

single meansingle proportion

(a) What is the level of significance? State the null and alternate hypotheses.

H₀:p= 11.1;H₁:p11.1H₀:= 11.1;H₁:11.1 H₀:= 11.1;H₁:< 11.1H₀:p= 11.1;H₁:p< 11.1H₀:p= 11.1;H₁:p> 11.1H₀:= 11.1;H₁:> 11.1

(b) What sampling distribution will you use? What assumptions are you making?

The Student'st, since we assume thatxhas a normal distribution with unknown.The standard normal, since we assume thatxhas a normal distribution with unknown. The Student'st, since we assume thatxhas a normal distribution with known.The standard normal, since we assume thatxhas a normal distribution with known.

What is the value of the sample test statistic? (Round your answer to two decimal places.)