An article in the Mid-American Journal of Business presents an analysis for a spring water bottling operation. One of the characteristics of interest is the amount of magnesium, measured in parts per million (ppm), in the water. The data in the table on page 737 (stored in SpWater) represent the magnesium levels from 30 subgroups of four bottles collected over a 30-hour period:
a. Construct a control chart for the range.
b. Construct a control chart for the mean.
c. Is the process in control?

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