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A study of 203 police officers in an eastern state found that their sample mean salary was $75,500 with a sample standard deviation of $3,000.

A study of 203 police officers in an eastern state found that their sample mean salary was $75,500 with a sample standard deviation of $3,000. The same study of 245 police officers in a northern state found that their sample mean salary was $74,500 with a sample standard deviation of $4,000.

Suppose that the population mean of all the police officers in this eastern state is $75,000 (

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