Not so long ago, I overheard a laboratory assistant in general psychology telling one of the boys in his section about a file of old examinations that we keep in the college library for students to consult. He ended brightly with the comment that it wouldn't do much good to study these exams. "You see, " he said, "we use the same questions from year to year, but we change the answers."
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F. Keller (1958) studied this question.
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