statistics

A coin mint has a specification that a particular coin has a mean weight of 2.5 g. A sample of 39 coins was collected. Those coins have a mean weight of 2.49491 g and a standard deviation of 0.01372 g. Use a 0.05 significance level to test the claim that this sample is from a population with a mean weight equal to 2.5 g. Do coins appear to conform to the specifications of the coin mint?

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  1. Z = (score-mean)/SEm

    SEm = SD/√n

    Use Z table, as indicated in previous posts.

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