Question: Define the parameter p1 - p2 to be the difference in the proportions of 21-year-old men and women in the United States who have a high school diploma. Researchers are interested in the hypothesis that p1 - p2 = 0.
a. What are the populations of interest in this situation?
b. Write the hypothesis in words, being careful to specify the populations and the parameter of interest, by completing this sentence: "Researchers are interested in the hypothesis that..."