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Two different hardening processes, (1) saltwater quenching and (2) oil quenching, are used on samples of...

Two different hardening processes, (1) saltwater quenching and (2) oil quenching, are used on samples of a particular type of metal alloy. The results are shown in the following table. Assume that hardness is normally distributed. (1) Assuming that the variances ?ଵ ଶ and ?ଶ ଶ are equal, construct a 95% confidence interval on the difference in mean hardness. (2) Construct a 90% confidence interval on the ratio ?ଵ ଶ ?ଶ ൘ ଶ. Does the assumption made earlier of equal variances seem reasonable?

Homework Answers

Answer #1

Assuming Data is

a)

b)

CI = (0.3054,3.0864)

yes, because 1 is present in confidence interval

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