Determine whether each of the following qualitative variables is a nominal or an ordinal variable. The values that the variable can take on are listed in parentheses following the name of the variable.

(a) Gender (M, F)

(b) Size of hospital (small, average, large)

(c) Blood type (A, B, AB, O)

(d) Radiation dosage (low, medium, high)

(e) Use of dietary supplements (yes, no)

(f) Fat in diet (low, medium, high)

(g) Eat lunch (always, sometimes, never)