Question: Two different annealing processes-one using water, and the other using oil-are used in the manufacturing of an alloy. Assume that the hardness of the alloy

Two different annealing processes-one using water, and the other using oil-are used in the manufacturing of an alloy. Assume that the hardness of the alloy is normally distributed. Two different samples size 10 are drawn from the output of the two processes. The hardnesses of the alloy in the samples are shown below.

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