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.
The future of data analysis. Annals of Mathematical Statistics 33 (1), (1962), page 13.
An approximate answer to the right question is worth a great deal more than a precise answer to the wrong question.John Tukey
The combination of some data and an aching desire for an answer does not ensure that a reasonable answer can be extracted from a given body of data.John Tukey