„Far better an approximate answer to the right question, which is often vague, than an exact answer to the wrong question, which can always be made precise.“
— John Tukey
The future of data analysis. Annals of Mathematical Statistics 33 (1), (1962), page 13. Variant: "An approximate answer to the right question is worth a great deal more than a precise answer to the wrong question." "as the renowned statistician John Tukey once reportedly said," according to Super Freakonomics page 224.