Consumer Reports stated that the mean time for a Chrysler Concorde to go from 0 to 60 miles per hour was 8.7 seconds. (a) If you want to set up a statistical test to challenge the claim of 8.7 seconds, what would you use for the null hypothesis?

< 8.7 = 8.7 8.7 > 8.7

(b) The town of Leadville, Colorado, has an elevation over 10,000 feet. Suppose you wanted to test the claim that the average time to accelerate from 0 to 60 miles per hour is longer in Leadville (because of less oxygen). What would you use for the alternate hypothesis?

> 8.7 < 8.7 = 8.7 8.7

(c) Suppose you made an engine modification and you think the average time to accelerate from 0 to 60 miles per hour is reduced. What would you use for the alternate hypothesis?

< 8.7 = 8.7 8.7 > 8.7

(d) For each of the tests in parts (b) and (c), would the P-value area be on the left, on the right, or on both sides of the mean?

both; left

left; right

left; both

right; left