Question: A vendor for your part casting claims they redeveloped the casting alloy with less tensile variability. The vendor claims that the new material will show

A vendor for your part casting claims they redeveloped the casting alloy with less tensile variability. The vendor claims that the new material will show a 20 of 10, 95% of the time. A six sample test yielded a standard deviation of 12 psi. Can a reduction in tensile strength variation be validated with 95% confidence? Use the Chi_Square test using this hypothesis to solve: H0: 21 (10)2 and H1: 21 < (10)2

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