As we discussed in class, common cause variation is best considered: a. Controll

Question

As we discussed in class, common cause variation is best considered:
a. Controllable at the source of the variation.
b. Called assignable cause as it is something that is periodic, yet common.
c. Can be reduced by statistical process control methods
d. The responsibility of the operator in charge on the production line.
e. The responsibility of management overseeing the production line.

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.

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

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

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.

Explanation / Answer

Explanation: Common cause variation is caused by unknown factors and common cause varation results in steady but random distribution of output around the average value of the data. This variation cannot be connected with any specific source. So, it cannot be controlled at the source or by using any statistical technique. This is why common cause variation is also known 'random variation' or 'inherent variation'. There is no immediate process or technique to rectify these variations. So, the management needs to intervene to rectify this variation.

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