For each of the following, state whether a one-proportion z-test or a two-proportion z-test would be appropriate, and name the populations.
a. A student watches a random sample of men and women leaving a Milwaukee supermarket with carts to see whether they put the carts back in the designated area. She wants to compare the proportions of men and women who put the carts in the designated area.
b. The pass rate for the Oregon bar exam is 65%. A random sample of graduates from Oregon University School of Law is examined to see whether their pass rate is significantly higher than 65%.