Question: Can changing diet reduce high blood pressure? Vegetarian diets and low-salt diets are both promising. Men with high blood pressure are assigned at random to four diets:
(1) normal diet with unrestricted salt;
(2) vegetarian with unrestricted salt;
(3) normal with restricted salt; and
(4) vegetarian with restricted salt. This experiment has
(a) one factor, the type of diet.
(b) two factors, high blood pressure and type of diet.
(c) two factors, normal/vegetarian diet and unrestricted/ restricted salt.
(d) three factors, men, high blood pressure, and type of diet.
(e) four factors, the four diets being compared.