(Step-by-Step) A steel pipe fittings company claims that the yield strength of its nontempered couplings is more variable than that of its tempered couplings.
Question: A steel pipe fittings company claims that the yield strength of its nontempered couplings is more variable than that of its tempered couplings. A random sample of nine tempered couplings has a standard deviation of 1.31 megapascals, and a similar sample of nine nontempered couplings has a standard deviation of 25.4 megapascals. From past data, it is known that the company’s production process results in normally distributed yield strengths. Test the company’s claim at \(\alpha =0.05\)
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