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The cost of a daily newspaper varies from city tocity. However, the variation among prices remainssteady with a standard deviation of 20. A studywas done

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The cost of a daily newspaper varies from city tocity. However, the variation among prices remainssteady with a standard deviation of 20¢. A studywas done to test the claim that the mean cost of adaily newspaper is $1.00. Twelve costs yield amean cost of 95¢ with a standard deviation of18¢. Do the data support the claim at the 1%level?

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