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An insurance agent says the standard deviation of the total hospital charges for patients involved in a crash in which the vehicle struck a construction

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An insurance agent says the standard deviation of the total hospital charges for patients involved in a crash in which the vehicle struck a construction barricade is less than $3600. A random sample of 28 total hospital charges for patients involved in this type of crash has a standard deviation of $3900. At a = 0.01 can you support the agent's claim? Use the P-value method to test the claim

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