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Will Shortz wants to know whether doing crossword puzzles influences IQ. Mr. Shortz already knows that the average IQ in the U.S. is 100, with

Will Shortz wants to know whether doing crossword puzzles influences IQ.

Mr. Shortz already knows that the average IQ in the U.S. is 100, with a standard deviation of 15.He picks a random U.S. sample of 25 people, has them all solve crosswords for 2 weeks and then measures their IQ.He finds that his sample has an average IQ of 106.

What statistical test should he run?

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