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 (μ = 65, σX = 24). Higher scores indicate a more positive attitude.
(a) Is this a one-or two-tailed test?
(b) In words, what are H0 and Ha?
(c) Perform the z-test.
(d) What do you conclude about attitudes here?
(e) Report your results in the correct format.