Practice Quiz

Six Sigma Black Belt Exam Prep

Category - Black Belt

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Sam’s Technologies Inc. produces computer chips for large medical and technological corporations. To determine the number of defective chips from each batch of inspected products, what type of chart should the managers use?
  1. P chart
  2. R chart
  3. C chart
  4. X chart
Explanation
Answer: A - The managers should use a P chart.

Key Takeaway: A P chart is a control chart for proportions that shows the proportion of defective or differing items during an inspection of products. To construct a P chart, managers must count the number of defective chips and divide it by the overall number of charts produced. During an inspection, each chip is classified as either ‘defective’ or ‘non-defective’. With a P chart, you can use equal or unequal sample sizes.
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