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You're manufacturing a widget and using an X-bar and R chart to control the critical feature of the product. Your normal process has the following attributes X-double bar is 225, R-bar is 12, n 8. Identify the upper and lower control limits for the X-bar chart 0 220.52 229.48 1.63

Interpret X bar and R chart. Plot both the X bar and R chart and identify the assignable causes Example Cont Use the above values and plot the X bar and Range chart. From both the X-bar and R charts, it is evident that most of the values are out of control hence, the process is not stable. Monitor the process after improvement.

X-BarR Control Charts Control charts are used to analyze variation within processes. There are many different flavors of If you answer YES to any of the above questions, then the R chart is out of control and the process limits on the X-Bar chart are meaningless. If the R Chart appears to be in control, check the run rules against the X

Maintenance data, 2. Examples of charts used for variable data are the X bar and R chart and the _____ a. Histogram b. Check Sheet c. P chart d. J chart, 3. The first step to analyzing the X-bar and R chart is _____. a. Determine the X-bar is the control b. Determine the R chart is the control c. Collect 20 subgroups of 5 samples d.

Answer a Explanation There is an assumption that links the normality to the control charts in the development of the performance properties of x bar and R charts that is, the underlying distribution of the quality characteristic is normal.

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3. An X-bar chart used to monitor a particular quality characteristic has an X-double-bar value of 32.0 and three- sigma limits at 30.5 and 33.5. The product is sampled in subgroups of four. The analyst considers that a quality characteristic is out of control if one subgroup falls outside either of the control limits or if seven successive subgroup averages fall on one side of the central line.

R bar Average of the mean Question The management of steel bar manufacturer is concerned about the production of it's steel bars. The diameter is a critical factor. R-bar chart UCL 1.777 x 0.9 1.5993 LCL 0.223 x 0.9 0.2007 The x-bar chart indicates that the production process is out of control. Therefore, production must stopped

An x-bar R chart can find the process mean x-bar and process range R over time. They provide continuous data to determine how well a process functions and stays within acceptable levels of variation. The following example shows how control limits are computed for an x-bar and R chart. The subgroup sample size used in the following example is three.

Question Construct X bar and R chart for the following cases. Week 6 - Control Chart for Variables 1 - X bar and R Control Chart Control Chart for variables.ppt Control Chart Formulas - Variable Control Chart.pdf Control Chart Factors.xls Case 01.xls Case 02.xls Case 01 A Computer upgrades have a normal time of 80 minutes.