Your professor told the class that, typically, 20% of the class receives As, 20% Bs, 35% Cs, 10% Ds, and 15% Fs. What is the probability that the student sitting next to you will receive an A or an F?

Which of the following best describes the condition(s) essential to the "wisdom of crowds" effect?

a. diversity of opinion b. independence of thought c. confidence d. diversity of opinion and independence of thought

At the center of the activation-synthesis hypothesis of dreaming is the need to

a. give expression to unfulfilled wishes. b. provide an outlet for repressed thoughts. c. provide explanations for physiological activity. d. exhibit socially acceptable behavior.