How can a jacket cost US$178 in the shops yet the El Salvadoran workers who made it get paid US$0.74? What happens in the factories in which they work?

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.