Numerical quantities focus on expected values, graphical summaries on unexpected values.

quote by John Tukey
Added by Lucian Velea
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An approximate answer to the right problem is worth a good deal more than an exact answer to an approximate problem.

quote by John Tukey
Added by Lucian Velea
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Far better an approximate answer to the right question, which is often vague, than the exact answer to the wrong question, which can always be made precise.

quote by John Tukey
Added by Lucian Velea
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