P0020_Soln - st research subject’s control 5 choices for...

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P0020_Soln.doc We need to know which control will match with which research subject so the order of selecting controls matters. Each control can be in the study only once, so there is no replacement. n ! n - k ( 29 ! = 6! 6 - 3 ( 29 ! = 120 Intuition behind this is that there are 6 choices for the 1
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Unformatted text preview: st research subject’s control, 5 choices for the 2 nd research subject’s control, and 4 choices for the 3 rd research subject’s control… 6 x 5 x 4 = 120...
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This note was uploaded on 02/01/2011 for the course BME 335 taught by Professor Dunn during the Spring '10 term at University of Texas.

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