We ask if visual memory ability for a sample of 25 art majors (X = 49) is better than that of engineers who, on a nationwide test, scored p = 45 and σX = 14. Higher scores indicate a better memory.
(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 memory ability here?
(e) Report your results in the correct format.