We ask if the attitudes toward fuel costs of 100 owners of hybrid electric cars
(X = 76) are different from those on a national survey of owners of non-hybrid cars (p = 65, σX = 24). Higher scores indicate a more positive attitude.
(a) Is this a one- or two-tailed test?
(b) In words what is H0 and Ha?
(c) Perform the z-test.
(d) What do you conclude about attitudes here?
(e) Report your results in the correct format.