Q.1
What are the graphical displays of tabular cusum called?
  • a) Cusum regular charts
  • b) Cusum regulated display
  • c) Cusum level display
  • d) Cusum status charts
Q.2
Which of these is a correct statement for cusum status charts?
  • a) A plot between Ci+ or Ci– and the sample number
  • b) A plot between the Ci+ or Ci– and the sample mean
  • c) A plot between the Ci+ or Ci– and the sample variance
  • d) A plot between the Ci+ or Ci– and the sample standard deviation
Q.3
Each vertical bar in cusum status chart represents __________
  • a) The value of Ci+ and Ci–
  • b) The value of Ci–
  • c) The value of Ci+
  • d) Neither the value of Ci+ nor Ci–
Q.4
What is analogous to the control limits as in Shewhart control charts, in the cusum status charts?
  • a) The reference value
  • b) The allowance value
  • c) The value of the decision intervals
  • d) The value of Ci+ and Ci–
Q.5
Which of these steps, is not carried out when the process becomes out-of-control when using the cusum control charts?
  • a) Search for an assignable cause
  • b) Taking corrective action
  • c) Restarting the control chart from zero
  • d) Continuing the control chart
Q.6
Which of these control charts may accurately tell when the assignable cause has occurred?
  • a) Cusum control charts
  • b) p-charts
  • c) c-charts
  • d) x bar and s charts
Q.7
What of these can be used as the decision interval for the tabular cusum charts?
  • a) 2σ
  • b) 1σ
  • c) 5σ
  • d) 4σ
Q.8
The value of K and H should be determined according to the ARL required for the corresponding cusum chart.
  • a) True
  • b) False
Q.9
The desired ARL is obtained by using the Siegmund’s approximation.
  • a) True
  • b) False
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