A heavy drinker conducts an experiment. On four consecutive nights he drinks 20 oz. of rum mixed

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A heavy drinker conducts an experiment. On four consecutive nights he drinks 20 oz. of rum mixed with the same brand of a cola drink. Each night a different brand of rum is used. Each following morning he has a hangover, and so he concludes that the hangover was the result of the common element, the cola.

(a) Discuss this from the perspective of experimental design.

(b) How could the drinker redesign the experiment so that a more logical conclusion would be drawn?

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