Decision regarding drop psychology course.

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When Paul Samuelson switched from physics to economics, Robert Solow is said to have remarked that the average IQ in both disciplines went up. A bystander responded that Solow's claim must be wrong because it implies that the average IQ for academia as a whole (which is a weighted average of the average IQ levels for each discipline) must also have gone up as a result of the switch, which is clearly impossible. Was the bystander right? A) Yes. If the average in both disciplines goes up then the population average must also rise. B) No. There is not enough information about the average IQ for the population. C) Yes. The weights may change so that the population average also increases. D) No. If those in physics had IQs above average and those in economics has IQs below average, then the population average need not have changed.

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