Practice Quiz

Lean Bronze

Category - Continuous Improvement

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Statistical process control charts monitor processes and may be applied to production or business processes. Statistical process control helps us understand variation and process capability and performance by using control charts of Cp, Cpk, Pp, Ppk, x-bar, and R, and attribute charts of - p, np, c, and u. Which control chart is used to plot units that do not conform when samples of equal size are taken from the process?
  1. P control charts.
  2. U charts.
  3. Moving average control charts or c charts.
  4. Np control charts.
Explanation
Answer: D - Np control charts are used to plot units that do not conform when samples of equal size are taken from the process. The np attribute control chart shows the number of defective units in a sample for determining a go or no go situation. The c chart shows the number of defects in a subgroup, the p chart shows the proportion of defects in a subgroup, and the u chart shows the defects per unit in a subgroup.
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