iSixSigma-Editorial

Average And Range – X-Bar and R: If the sample size is relatively small (e.g., less than 10-15), we can use the range instead of the standard deviation of a sample to construct control charts on X-Bar (arithmetic mean) and the range, R. The range of a sample is simply the difference between the largest and smallest observation. The X-bar and R control chart is used with continuous/variable data when subgroup or sample size is between 2 and 15.

Wizard Home > Continuous/Variable Data Sample Size Selector Control Chart Suggestion Individuals And Moving Range – X and Rm Control Chart Description Control charts for individual measurements (e.g., the sample size = 1) use the moving range of two successive observations to measure the process variability. The combination of the X Chart for Individuals and […]

Wizard Home > Control Chart Wizard Home Question How large is your continuous/variable data sample size? Choices Please select your sample size from the choices below: Sample Size Of One Sample Size Is Small (Usually Less Than 10-15) Sample Size Is Small (Usually Less Than 10-15), Median Value Known Sample Size Is Large (Usually Greater […]

This Control Chart Wizard will guide you through the process of determining your data type, help you determine the correct control chart, and provide the proper formulas for creating a control chart for your process.