If the effect of the act of measurement is disregarded, which of the following variables are best regarded fundamentally as forming a discrete series, and which a continuous series?
(a) Temperature.
(b) Time.
(c) Sex.
(d) Brands of orange juice.
(e) Size of family.
(f) Achievement score in mathematics.
(g) Merit ratings of employees.
(h) Score on an introversion-extroversion scale.