Find the test statistic and do the two-sample test for equality of proportions. Is the decision close?
a. Repeat buyers at two car dealerships: p1 = .30, n1 = 50, p2 = .54, n2 = 50, a = .01, left tailed test.
b. Honor roll students in two sororities: p1 = .45, n1 = 80, p2 = .25, n2 = 48, a = .10, two tailed test.
c. First-time Hawaii visitors at two hotels: p1 = .20, n1 = 80, p2 = .32, n2 = 75, a = .05, left tailed test.