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Exam 25: Process Capability and Spc

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Question 21

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What is the difference between statistical process control (SPC)and statistical quality control (SQC)?

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Statistical process control (SPC)is conc...

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Question 22

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The capability index (C_pk)calculates the percentage of items being produced within specifications.

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Question 23

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Variation in production systems that is caused by factors that can be clearly identified and possibly even managed is called assignable variation.

You have just used the capability index (C_pk) formulas to compute the two values "min [2,2.5]".Which of the following is the proper interpretation of these numbers?

In monitoring process quality we might use which of the following statistics?

If you are going to develop an "R" chart based on range statistics and you are using a sample size of 15 for your charting purposes.Which of the following is the upper control limit D4 factor for the chart?

Attributes are those quality characteristics that are classified as either conforming or not conforming to specifications.

You are developing an "X-bar" chart based on sample means.You know the standard deviation of the sample means is 4,the desired confidence level is 99.7 percent and the average of the sample means is 24.Which of the following is your UCL?

One-hundred percent inspection is justified when the cost of inspection is low.

Processes produce goods and services that have some measurable variation in attributes.What is the quality philosophy that companies which insist on design tolerances set six standard deviations of attribute variation away from the mean are operating under?

If the fraction defective is 0.4 based on a sample size of 100,what is the standard deviation used in constructing the "p" chart?

What does it mean when we say that a process is capable?

LTPD in acceptance sampling stands for "lots of tolerance for parts defective".

Genichi Taguchi's view of the cost of quality is that variance is a discontinuous function.

To obtain a 99.7 percent confidence level in a "p" chart we would use a value of 3 for "z".

AQL stands for accepting questionable lots in production quality management.

An example of assignable variation in a production system may be that a machine is not adjusted properly.

Measurement by attributes means taking a sample,measuring the attribute in question and determining the level of quality in the population from which the sample was drawn.

Which of the following should we use an "R" chart to monitor process quality?

In acceptance sampling,the value for the acceptance number (c)is determined by the interaction of the acceptable quality level (AQL),the lot tolerance percent defective (LTPD),the probability of rejecting a high quality lot (alpha)and the probability of accepting a low quality lot (beta).