CUMSUM Chart Interpretation: Answer the following questions with the information
ID: 354945 • Letter: C
Question
CUMSUM Chart Interpretation:
Answer the following questions with the information that will be provided in the data images below:
1. Did the Xbar-R chart fail any test? __________ If so how many__________ What test(s) did it fail?
__________________________________________________________________________________
2. Where there any points outside the control lines of the CUSUM chart? ___________
3. At what point if any was outside of the CUSUM chart?
4. What would a point outside the CUSUM chart indicate, what action should be taken?
Data results from Minitab:
Test Results for Xbar Chart of AtoBDist 4 out of 5 points more than 1 -t deviation Erom center line (on Failed at TestResults for R Chart of AtoBDist ;??· 4??? ?.x se E.JuMS ?????????.it RM E.JuiSi! f ;? 73rs' ;??-1. ???2%??! E?XMy4E»: Test Failed at points: 17. 18 WARNING - If graph is updated with new data, the results above may no longer be correct Xbar-R Chart of AtoBDist ample 33L-17.5 ampleExplanation / Answer
1. X-bar chart failed the test - 4 out of 5 points out of 1 SD and there is 1 point where X-bar chart failed
R-chart failed at 2 points the test where 6 continuous points are tested.
The total failure occurred at 3 points.
2. Yes, there are points outside the Upper Control Limits of the CUMSUM chart.
3. 4,5,6,7,8,9,10 i.e. there are 7 points at which it was outside CL.
4. There can be several reasons:
Change in the labor, change in the process or material, erratic fluctuations due to external parameters like temperature, etc.