Effects of a favor and liking on compliance
81 freshman males of Stanford University, 4 excluded; 3 x 2 design; tickets 25 cents; mean purchases 1.73 (favour from confederate), 1.08 (Coke from experimenter), 0.92 (no favour); liking correlated with compliance overall (r = .43) and among controls (r = .46) but not in the favour conditions (r = .14, ns).
81 freshman males of Stanford University, 4 excluded; 3 x 2 design; tickets 25 cents; mean purchases 1.73 (favour from confederate), 1.08 (Coke from experimenter), 0.92 (no favour); liking correlated with compliance overall (r = .43) and among controls (r = .46) but not in the favour conditions (r = .14, ns).
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Regan, D. T. (1971). Effects of a favor and liking on compliance. Journal of Experimental Social Psychology, 7(6), 627-639. doi:10.1016/0022-1031(71)90025-4.