A U S dime weighs 2 268 grams when minted A random sample of 15 circulated dimes showed a mean weight of 2 256 grams with a standard deviation of 026 gram (a) Using 05, is the mean weight of all circulated dimes lower than the mint weight State your hypotheses and decision rule (b) Why might circulated dimes weigh less than the mint specification

Question: A U.S. dime weighs 2.268 grams when minted. A random sample of 15 circulated dimes showed a mean weight of 2.256 grams with a standard

A U.S. dime weighs 2.268 grams when minted. A random sample of 15 circulated dimes showed a mean weight of 2.256 grams with a standard deviation of .026 gram.
(a) Using α = .05, is the mean weight of all circulated dimes lower than the mint weight? State your hypotheses and decision rule.
(b) Why might circulated dimes weigh less than the mint specification?

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