Studies show that people are most likely to participate in politics when a. government officials officially invite input and feedback. b. someone asks them to get involved. c. they are able to participate electronically through email and computer voting. d. they are paid to do so.

For each of the following examples of data, determine which scale of measurement is used. a) the number of miles joggers run per week. b) the starting salaries of graduates of mba programs c) the months in which a firm's employees choose to take their vacations. d) the final letter grades received by students in a math course.