MCQOPTIONS
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MCQOPTIONS
This section includes 15 Mcqs, each offering curated multiple-choice questions to sharpen your Statistical Quality Control knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The starting value of the variable zi is always equal to μ0. |
| A. | True |
| B. | False |
| Answer» C. | |
| 2. |
The weights of EWMA charts may also increase. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
If the observations xi are independent random variables with variance σ2 then according to the EWMA charts, the variance of zi will be ________________ |
| A. | \(\sigma_{zi}^2 = \sigma^2 (\frac{λ}{2-λ})[1+(1+λ)^{2i}]\) |
| B. | \(\sigma_{zi}^2 = \sigma^2 (\frac{λ}{2-λ})[1+(1-λ)^{2i}]\) |
| C. | \(\sigma_{zi}^2 = \sigma^2 (\frac{λ}{2-λ})[1-(1-λ)^{2i}]\) |
| D. | \(\sigma_{zi}^2 = \sigma^2 (\frac{λ}{2+λ})[1-(1-λ)^{2i}]\) |
| Answer» D. \(\sigma_{zi}^2 = \sigma^2 (\frac{λ}{2+λ})[1-(1-λ)^{2i}]\) | |
| 4. |
Which of these is an ideal chart for individual measurements among these all? |
| A. | p-chart |
| B. | Cusum charts |
| C. | EWMA charts |
| D. | x bar and R chart |
| Answer» D. x bar and R chart | |
| 5. |
Which of these is the use of the EWMA charts? |
| A. | In time series modeling |
| B. | In Real-time processing |
| C. | In acceptance sampling |
| D. | In designing of experiments |
| Answer» B. In Real-time processing | |
| 6. |
GMA stands for ___________ |
| A. | Geosum moved average |
| B. | Geometric Moving average |
| C. | Geometrically moved average |
| D. | Geocentric moving average |
| Answer» C. Geometrically moved average | |
| 7. |
Which of these is another name of EWMA charts? |
| A. | GMA charts |
| B. | AMA charts |
| C. | EMA charts |
| D. | RMA charts |
| Answer» B. AMA charts | |
| 8. |
What is the starting value of the EWMA? |
| A. | Zero |
| B. | Process target mean |
| C. | Process target variance |
| D. | Process target standard deviation |
| Answer» C. Process target variance | |
| 9. |
Which of these is correct for λ in EWMA expression? |
| A. | 0 > λ |
| B. | 1 < λ |
| C. | 1 ≤ λ |
| D. | 0 < λ ≤ 1 |
| Answer» E. | |
| 10. |
What is the correct expression for the EWMA? |
| A. | zi = λxi + (1-λ) zi-1 |
| B. | zi = λxi – (1-λ) zi-1 |
| C. | zi = λxi + (1-λ) zi+1 |
| D. | zi = λxi + (1+λ) zi-1 |
| Answer» B. zi = λxi – (1-λ) zi-1 | |
| 11. |
Who did first introduce the EWMA charts? |
| A. | Lucas (1990) |
| B. | Saccucci (1990) |
| C. | Roberts (1959) |
| D. | Crowder (1987a, 1989) |
| Answer» D. Crowder (1987a, 1989) | |
| 12. |
Which of these is not an advantage of EWMA control charts? |
| A. | Almost equivalent performance to the cusum charts |
| B. | Easier set up than cusum charts |
| C. | Easier to operate than cusum charts |
| D. | Intricacy is a little higher than cusum charts |
| Answer» E. | |
| 13. |
EWMA charts are better than Shewhart control charts in detecting the ___________ shifts. |
| A. | Large process |
| B. | Medium process |
| C. | Small process |
| D. | Every process |
| Answer» D. Every process | |
| 14. |
What is the full form of EWMA? |
| A. | Exponentially weighted moving average |
| B. | Exponentially weighted measured approximate |
| C. | Exponentially weighted moving approximate |
| D. | Exponentially weighted measured average |
| Answer» B. Exponentially weighted measured approximate | |
| 15. |
What is the full form of E in the EWMA chart? |
| A. | Exponentially |
| B. | Experimentally |
| C. | Exactly |
| D. | Estimated |
| Answer» B. Experimentally | |