(Answered) A company that manufactures precision special-alloy steel

Statistics

A company that manufactures precision special-alloy steel shafts claims that the variance in the diameters of shafts is no more than 0.0003. A random sample of 10 shafts gave a sample variance of 0.00027. At the 5% level of signi?cance, test whether the company's claim can be substantiated.

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