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Exam 23 Managing Quality

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Question 51

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Briefly explain what the Central Limit Theorem has to do with control charts.

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The CLT underlies the distribu...

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Question 52

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The steeper an OC curve, the better it discriminates between good and bad lots.

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Question 53

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Which of the following statements about acceptance sampling is true?

A manager wants to build 3-sigma control limits for a process. The target value for the mean of the process is 10 units, and the standard deviation of the process is 6. If samples of size 9 are to be taken, the UCL and LCL will be

In the table below are selected values for the OC curve for the acceptance sampling plan n=210, c=6. Upon failed inspection, defective items are replaced. Calculate the AOQ for each data point. (You may assume that the population is much larger than the sample.) Plot the AOQ curve. At approximately what population defective rate is the AOQ at its worst? Explain how this happens. How well does this plan meet the specifications of AQL=0.015, α=0.05; LTPD=0.05, β=0.10? Discuss.

When a lot has been accepted by acceptance sampling, we know that

X-bar charts are used when we are sampling attributes.

What do the terms producer's risk and consumer's risk mean?

A local manufacturer supplies you with parts, and you would like to install a quality monitoring system at his factory for these parts. Historically, the defect rate for these parts has been 1.25 percent (You've observed this from your acceptance sampling procedures, which you would like to discontinue). Develop ± 3σ control limits for this process. Assume the sample size will be 200 items.

Average outgoing quality (AOQ) usually

Acceptance sampling accepts or rejects an entire lot based on the information contained in the sample.

The higher the process capability ratio, the greater the likelihood that process will be within design specifications.

A run test is used

To set -chart upper and lower control limits, one must know the process central line, which is the

A process range chart illustrates the amount of variation within the samples.

The __________ is a quality control chart used to control the number of defects per unit of output.

Acceptance sampling

The local newspaper receives several complaints per day about typographic errors. Over a seven-day period, the publisher has received calls from readers reporting the following number of errors: 4, 3, 2, 6, 7, 3, and 9. Based on these data alone, what type of control chart(s) should the publisher use?

Some degree of variability is present in almost all processes.

A department chair wants to monitor the percentage of failing students in classes in her department. Each class had an enrollment of 50 students last spring. The number of failing students in the 10 classes offered that term were 1, 4, 2, 0, 0, 0, 0, 0, 0, and 3, respectively. Compute the control limits for a p-chart at the 95% confidence level. Is the process in control?