Yield and quality control

Which chart divides data into intervals and shows the frequencies as bars to see the shape of the distribution of variation?

  1. AScatter diagram
  2. BCause-and-effect diagram
  3. CHistogram
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Answer: C. Histogram

A histogram divides measured values into intervals and shows the number of data points in each interval as the height of a bar. It reveals the center, spread and skew of the distribution and whether there are two peaks, and is used to judge the state of a process by comparing it with the specification range.

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More Yield and quality control questions

  1. Which process capability index is used when the process mean is offset from the center of the specification?
  2. Which type of control automatically adjusts equipment processing conditions for the next lot or wafer based on, for example, measurement results from earlier steps?
  3. Which technique identifies possible failure modes in a product or process, evaluates their effects and severity, and takes countermeasures in advance?
  4. Which chart plots pairs of two characteristic values to examine their correlation?
  5. What is it called that shows yield improving over time as defect causes are analyzed and addressed after a new process is launched?