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Employees at a construction and mining company claim that the mean salary of the company's mechanical engineers is less than that of one of its

Employees at a construction and mining company claim that the mean salary of the company's mechanical engineers is less than that of one of its competitors, which is $68000. A random sample of 30 of the company's mechanical engineers has a mean salary of $66900 with a standard deviation of $5500. At a=0.05 test the company's claim.

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