X Bar Chart & R Chart
X Bar Chart & R Chart X-bar Chart X Bar chart is used to monitor the centering of process to control its accuracy. X - bar chart is a type of Shewhart control chart that is used to monitor the arithmetic means of successive samples of constant size, n. This type of control chart is used for characteristics that can be measured on a continuous scale, such as weight, temperature, thickness etc. For example, one might take a sample of 5 shafts from production every hour, measure the diameter of each, and then plot, for each sample, the average of the five diameter values on the chart. R-Chart R chart is used monitor the dispersion or precision of the process. The construction of X-Bar chart & R Chart is- 1. Select the characteristics for applying a control chart. 2. Select the appropriate type of control chart. 3. Collect the data. 4. Choose the rational sub group i.e., Sample. 5. Calculate the average X-bar& ...