The weights of a simple random sample of 35 pennies have a mean of 0.3910 g and a standard deviation of .04 g. Use a .05 significance level to test that all pennies have weights with a mean greater than 0.230 g.
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The weights of a simple random sample of 35 pennies have a mean of 0.3910 g and a standard deviation of .04 g. Use a .05 significance level to test that all pennies have weights with a mean greater than 0.230 g.