Survey of students. A survey of students in an introductory statistics class asked the following questions: (a) What is your age in years? (b) Do you like to dance (yes, no)? (c) Can you play a musical instrument (not at all, a little, pretty well)? (d) How much did you spend on food last week? (e) What is your height in inches? (f) Do you like broccoli (yes, no)? Classify each of these variables as categorical or quantitative and give reasons for your answers.