Question: =+people could exhibit large differences in effort, even from the same type of stool, a sample of nine people was selected and each was tested

=+people could exhibit large differences in effort, even from the same type of stool, a sample of nine people was selected and each was tested on all four stools:

Subject 1 2 3 4 5 6 7 8 9 Type of stool A 12 10 7 7 8 9 8 7 9 B 15 14 14 11 11 11 12 11 13 C 12 13 13 10 8 11 12 8 10 D 10 12 9 9 7 10 11 7 8

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