Because of High Test Costs,a Sample of Single Wastewater Sludge $\bar{x}$

question 84

Multiple Choice

Because of high test costs,a sample of single wastewater sludge is tested daily for dissolved oxygen content.The appropriate control chart is:

• A) \( \bar{x} \)-chart and R-chart.
• B)u-chart.
• C)x-chart and moving range chart.
• D)x-chart and R-chart.

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