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in an analysis investigating the usefulness of pennies The Sims portions of 81 randomly-selected credit card...

in an analysis investigating the usefulness of pennies The Sims portions of 81 randomly-selected credit card charges from students are recorded and they have a mean of 47.610 and a standard deviation of 30.5 cents if the amounts from zero cents to 99 Cents are all equally likely the mean is expected to be 49.5% and the population standard deviation is expected to be 28.866 cents use a 0.025 significance level to test the claim that the sample is from a population with a standard deviation equal to 28.866 cents

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