A study was conducted on a random sample of professional gamblers (N = 17). They were asked to watch videos of 20 different poker players in a recent tournament and to determine whether or not those players were bluffing (i.e. betting heavily when they had a very weak hand). In fact on half of the videos, the players were bluffing, and the participants were told this (but not specifically which players were bluffing). The mean number of "correct decisions" by the professional gamblers (said the player was bluffing, when he/she actually was; said the player was not bluffing when he/she was not) was 10.8, with a standard deviation of 2.6. Can professional gamblers tell if a player is bluffing (at alpha = .05)?

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