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HW_8_sol

# HW_8_sol - Homework Solutions Chapter 8 1 P-charts are used...

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Homework Solutions– Chapter 8 1. P-charts are used to monitor the process for attribute data. These are typically binomial “go, no-go” data. An example of a P-chart is percent of pieces nonconforming. X charts are used for charting population values for continuous measurement. X charts operate effectively with smaller sample sizes than P- charts, but it is more involved to analyze the sample for an X chart since a measurement must be taken. A rule of thumb for the sample size of a P-chart is to have at least one defective in each sample. This can require a relatively large sample size in some cases. If the process is slow, an X chart will generally be a better choice since it functions with smaller sample sizes. An example of an X chart is average time to complete a mile run for one person. R charts are used to compute process ranges for variable data, and are generally used in concert with X charts.

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