The competitive advantage of some small American factories such as in Tolerance Contract Manufacturing lies in their ability to produce parts with very narrow requirements, or tolerances, that are typical in the aerospace industry. Consider a product with specifications that call for a maximum variance in the lengths of. the parts of 0.0004 . Suppose the sample variance for 38 parts turns out to be s2=0.0005. Use =0.05, to test whether the population variance specification is being violated. H0:Hs: Test statistic = (to 2 decimals, if required) The p-value is Use Table 11:1. 7 Hide Feedback.