Certified Quality Auditor (CQA) Prasctice Exam

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The fraction of nonconforming products is most commonly plotted on which type of control chart?

P chart
U chart
NP chart
C chart

The correct answer is: P chart

The fraction of nonconforming products is most effectively represented using a P chart. This type of control chart is specifically designed for quality control when dealing with binomial outcomes, which involve two possible results (such as conforming or nonconforming). The P chart tracks the proportion of defective items in a sample over time, making it particularly useful in identifying trends or shifts in the fraction of nonconforming items produced. The P chart facilitates the monitoring of the variability of the proportion of defective products within a defined timeframe or across different samples. This capability is pivotal for maintaining quality assurance processes and making informed decisions based on the performance of the production process. In contrast, the other types of charts serve different purposes. A U chart is used for counts of nonconformities per unit when the sample size varies, an NP chart monitors the number of nonconforming items in a fixed sample size, and a C chart focuses on the count of nonconformities in a sample. While they all play roles in quality management, only the P chart is tailored to track the fraction of nonconforming products specifically.