These three short pieces were entries to a competition on "Tricky Stats" that were each published in British Psychological Sciety's monthly periodical, The Psychologist, in 1994 or 1995. [There is a slightly longer unpublished version of the piece on 'scales' at the end of this e-paper. See also a short communication by this author in the journal Appetite (53, 438-441) for 2009, called "The basics of quantitative judgment."] The series then ended
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