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Mathematics, 06.04.2021 19:30 winterblanco

2. Fifteen successive heats of a steel alloy are tested for hardness. The resulting data are shown in Table
6E.21. Set up a control chart for the moving range
and a control chart for individual hardness measure-
ments. Is it reasonable to assume that hardness is
normally distributed?

2. Fifteen successive heats of a steel alloy are tested for

hardness. The resulting data are show

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