Question: 19. Penny Thoughts U.S. pennies made before 1983 are 97% copper and 3% zinc, whereas pennies made after 1983 are 3% copper and 97% zinc.

19. Penny Thoughts U.S. pennies made before 1983 are 97% copper and 3% zinc, whereas pennies made after 1983 are 3% copper and 97% zinc. Listed below are weights (in grams) of pennies from each of those two time periods. (Data were obtained by the author.) Does there appear to be a considerable difference in the standard deviations?

Before 1983: 3.1582 3.0406 3.0762 3.0398 3.1043 3.1274 3.0775 3.1038 3.1086 3.0586 After 1983: 2.5113 2.4907 2.5024 2.5298 2.4950 2.5127 2.4998 2.4848 2.4823 2.5163

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