What does a frequency chart help determine in a sampling plan?

A frequency chart serves as a valuable tool in a sampling plan by displaying the number of occurrences of various outcomes within a dataset. This visual representation aids in determining how many parts should be inspected to ensure an accurate understanding of the quality of the production batch.

When analyzing the frequency data, one can identify patterns, trends, and the distribution of defects or errors across the parts. By assessing this information, quality control professionals can make informed decisions about the appropriate sample size needed for inspection to confidently gauge the overall quality level without inspecting every single part. This focused approach not only improves efficiency but also optimizes resource allocation during the inspection process.

While other aspects of a sampling plan, such as cost, time, and type of parts, are indeed important, they are not directly determined by the frequency chart itself but rather by the insights that the frequency distribution provides regarding the need and scale of inspection.