Weights of Pennies The preceding exercise involved the claim that post-1983 pennies have weights with a standard deviation less than 0.0230 g. Data Set 21 in Appendix:

Data Sets includes the weights of a simple random sample of 35 pre-1983 pennies, and that sample has a standard deviation of 0.03910 g. Use a 0.05 significance level to test the claim that pre-1983 pennies have weights with a standard deviation greater than 0.0230 g.

Does it appear that weights of pre-1983 pennies vary more than those of post-1983 pennies?