Because of high test costs,a sample of single wastewater sludge is tested daily for dissolved oxygen content.The appropriate control chart is:
A)-chart and R-chart.
B)u-chart.
C)x-chart and moving range chart.
D)x-chart and R-chart.

Question

Quizplus · Accepted Answer

Since the sample size is 1 (a single wastewater sludge), the appropriate chart is x-chart and moving range chart. A u-chart is used for count data, while a chart and R-chart and x-chart and R-chart are used for continuous data with sample sizes larger than 1. Therefore, C is the best choice.

Because of High Test Costs,a Sample of Single Wastewater Sludge