Question: National norms for the test mentioned in Exercise 53 exist and show that the adult male population has a standard deviation of 28 on this

National norms for the test mentioned in Exercise 53 exist and show that the adult male population has a standard deviation of 28 on this test. Can we say, with a = .05, that junior high-school boys are more variable in their test performance than the population of adult males? How about the senior high-school boys? The combined junior and senior high-school groups?

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