Four different alloy compositions have been used in manufacturing metal rods, with the hardness measurements shown here.

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Four different alloy compositions have been used in manufacturing metal rods, with the hardness measurements shown here. Use the 0.05 level of significance in testing whether the population means might be equal, then construct the 95% confidence interval for each population mean. (Use data file XR12094.)
Four different alloy compositions have been used in manufacturing metal
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