The tensile strength of sheet metal screws is monitored by selecting a sample of 4 screws at 30-minute intervals, then seeing how many pounds of force are required to break each screw. Given the following data, also listed in file XR20043, construct 3-sigma mean and range control charts and evaluate whether the process is in control.
Answer to relevant QuestionsDifferentiate between the p-chart and the c-chart. Under what circumstances would each be used? Twenty samples have been taken from a production run. Given the following data, construct a 3-sigma p-chart and evaluate whether the process is in control. Can the Process Capability Index (Cpk) ever be greater than the Process Potential Index (Cp)? If so, how? If not, why not? A process has generated the output (in centimeters) listed in file XR20063. a. For a series of samples, each with n = 4, construct and interpret the x-bar and range charts for this process. Does it appear to be in ...Following their manufacture, plastic shims are sampled at periodic intervals and their thickness (in millimeters) measured. Each sample consists of n = 3 shims, and the following data have been collected for the past 20 ...
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