"Kellogg’s Raisin Bran comes in 15-, 20-, and 25.5-ounce boxes, all of which bear the “Two scoops!” claim. This observation suggests two alternative hypotheses:
(A) Scoop size is independent of box size. In other words, the same scoops are used to add raisins to each box, regardless of box size, so that the number of raisins per box is constant.
(B) Scoop size is proportional to box size. In other words, larger scoops are used for the larger boxes so that the number of raisins per ounce of cereal remains constant."
This is a fascinating application of scientific reasoning. Read the whole article here.
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