Lean Six Sigma Green Belt Sample Paper: Control 1. If a control chart is not in control, which of the following inferences is correct? Only Common causes are present Only Special Causes are present Special and Common causes are present Neither Special nor Common are present2. The quality manager inspects 100 mobiles every day. He checks whether the mobiles are working or not. He would like to control chart this data. What is the most appropriate control chart to use in this case? np c u I‐MR3. Green Belt wants to control chart delivery time of pizzas. Green Belt inspects delivery time of 5 random selected pizzas every evening from 6pm ‐ 9pm. Consider the data to be normally distributed, what control chart should be used? np chart p chart Xbar‐R I‐MR4. Which of the following test for special causes is not used for ‘p’ chart? 6 points increasing or decreasing 14 points alternating up and down 4 out of 5 points more than 1 standard deviation from centre line 9 points in a row on the same side of the centre line5. Please refer to Figure 3 and comment Individual and Moving Range Charts are in control Only Individual chart is in control Only Moving Range chart is in control Neither charts are in control6. We use control charts to monitor Xs (inputs) Y (output) Both ‘a’ and ‘b’ Assessment of Performance7. Process Owner is monitoring number of errors in a transaction. Process Owner inspects 5% of the total transactions in a day. The number of transactions varies every day. What type of control chart should be used? u chart p chart c chart np chart8. A control plan may have Risk Mitigation plan Audit Plan Statistical Process Control Plan All of the above9. Benefit/s of Poka Yoke devices Reduction/elimination in formal training programs Reduction/elimination of inspection Reduction/elimination of rework All of the above10. The chest measurement of 20 shirts is inspected per day. What is the most appropriate control chart to detect the presence of special cause? p chart I‐MR Xbar‐R Xbar‐STime is Up!