16.2 Fermentation. Gas produced from a biological fermentation is offered for sale with theassurance that the average methane content is 72%. A random sample of n = 7 gas specimensgave methane contents (as %) of 64, 65, 75, 67, 65, 74, and 75. (a) Conduct hypothesis testsat significance levels of 0.10, 0.05, and 0.01 to determine whether it is fair to claim an averageof 72%. (b) Calculate 90%, 95%, and 99% confidence intervals to evaluate the claim of anaverage of 72%.
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