Dr. Jones, the history professor, administers a 30-item test the first day of class to ascertain his students' initial level of knowledge of American history. Bob got a 0, Joe a 10, Betty a 20, and Mark and Sheela each got a perfect 30.
(a) In all likelihood, what kind of scale of measurement is this? Explain.
(b) Can Dr. Jones conclude that Bob does not know anything about American history? Explain.
(c) Is Betty's knowledge of American history twice as great as Joe's? Explain.
(d) Can Dr. Jones conclude that Mark and Sheela have an equally good knowledge of American history? Explain.