Q.1
The largest standard deviation of the sample mean from the target, not leading to an immediate out-of-control signal, is called _______________ of a control chart.
  • a) ARL
  • b) UCL
  • c) Signal resolution
  • d) Signal resistance
Q.2
For a Shewhart control chart, what is the value of SR?
  • a) Zα/2
  • b) 2
  • c) L
  • d) 2L
Q.3
Which of these is a having a constant SR?
  • a) A x chart
  • b) A Cusum chart
  • c) An EWMA chart
  • d) Every control chart
Q.4
Which of these is not having a constant SR value?
  • a) c-chart
  • b) R-chart
  • c) p-chart
  • d) EWMA chart
Q.5
What is the value of the term “w” called in the SR value of a EWMA chart?
  • a) First EWMA value
  • b) Last EWMA value
  • c) Value of EWMA statistic
  • d) Weight average
Q.6
Small values of λ gives ______ values of the SR (EWMA).
  • a) Larger
  • b) Lower
  • c) Equal
  • d) Both, larger and smaller
Q.7
Which of these methods can be used to counteract the signal resistance in case of small values of λ with EWMA charts?
  • a) To use a cusum chart paralleled
  • b) To use a Shewhart control chart paralleled
  • c) To just wait for EWMA chart to be plotted till 50 observations
  • d) To increase the value of process mean target
Q.8
Who were the first persons to recommend the use of Shewhart control charts with the EWMA charts with low values of λ?
  • a) Woodall and Mahmoud
  • b) Woodall and Roberts
  • c) Roberts and Mahmoud
  • d) Roberts and Crowder
Q.9
Which of these is not an advantage of using a Shewhart control chart with the EWMA chart?
  • a) Detection of larger process shifts
  • b) ARL adjustment
  • c) Counteraction to the high signal resistance value
  • d) No defects
Q.10
Which of these is not an advantage of low value of λ in the case of EWMA charts?
  • a) Good ARL performance
  • b) Insensitivity to the normality of the data
  • c) Good ability to detect the larger process shifts
  • d) Easy detection of small process shifts
Q.11
In the case of Shewhart charts, if the data is not according to the normal distribution, the actual in-control ARL (ARLwill be ____________ the expected value.
  • a) Considerably higher than
  • b) Considerably lower than
  • c) Equal to
  • d) Almost equal to
Q.12
The EWMA charts are recommended for phase II applications as it is totally a nonparametric procedure.
  • a) True
  • b) False
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