41. Testing whether a cellphone boots up the first time 100% correctly is an exa

Question

41. Testing whether a cellphone boots up the first time 100% correctly is an example of:

a. Supplier certification and management.

b. In-process control.

c. Finished goods control.

d. Statistical process control.

e. None of the above.

42. Which of the following is not related to a continuous metric?

a. Measured as the degree of conformance to a specification

b. x-bar and R-charts

c. p-chart d. Time

e. n-charts

43. Honda wants to monitor the number of blemishes (scratches, blisters, etc.) on the fenders of its cars using a statistical process control chart. The most appropriate type of SPC chart is:

a. X-bar.

b. R-bar chart.

c. CpK chart.

d. C-chart.

e. Q-chart

44. In the context of designing control charts, which of the following is true of a sample size?

a. A large sample allows small changes in process characteristics to be detected with higher probability than a small sample size.

b. A small sample is used to detect process shifts of two standard deviations or smaller.

c. A large sample size is desirable to keep the cost associated with sampling low.

d. A small sample size provides greater degrees of statistical accuracy in estimating the true state of control than a large sample size.

e. A small sample allows for medium-sized changes in process characteristics to be detected with a stationary probability than a small sample size.

45. Which of the following is true of special cause variation?

a. It cannot be explained or understood

. b. It occurs sporadically and can be prevented.

c. It cannot be detected using statistical methods.

d. It accounts for about 80 to 95 percent of the observed variation in a process.

Explanation / Answer

41. The correct answer is “c. Finished goods control”.

Cellphone comes under the finished goods category. Hence, testing whether a cellphone boosts up 100 percent correctly is an example of c. finished goods control.

42. The correct answer is “c. p-chart”.

Unlike other metrics, if a metric is discrete, then it generally utilizes p-chart or c-chart. Rest of the charts are used for continuous metric.

43. The correct answer is “d. C-chart”.

Count Control chart or c chart is used to monitor the number of defects in a given sample. Since, Honda wants to monitor the number of blemishes on the fenders of its cars, therefore c-chart would be the best SPC chart to do so.

44. The correct answer is “a. A large sample allows small changes in process characteristics to be detected with higher probability than a small sample size.”

Smaller sample size helps in keeping the cost low although it has limited accuracy. Contrary to this, large sample sizes are more costly as compared to the smaller ones, however it helps in detecting the smaller changes in the process characteristics with higher probability.

45. The correct answer is “b. It occurs sporadically and can be prevented.”

Special cause variations of a system are generally caused due to some kind of defect. These are neither predictable nor inherent in a system. Besides, special cause variation occurs infrequently in a system and can be avoided with proper precautionary measures and control.

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