It is commonly accepted that athletes should ‘‘carbo load,” that is, eat lots of carbohydrates, the day before an event requiring physical endurance. Is there any truth to this? Suppose you want to design an experiment to find out for yourself: ‘‘Does carbo loading actually improve athletic performance the following day?” You recruit 50 athletes to participate in your study.
(a) How would you design a randomized comparative experiment?

(b) How would you design a matched pairs experiment?

(c) Which design do you think is better for this situation? Why?