Ian and Kelly still have date night every Thursday in order to have time together away from the family, but lately they barely talk and they have started just going to the same restaurant instead of trying new things every week like they had originally planned. They are experiencing

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.