Operations Management Study Set 5

Statistics

Quiz 10 :

Quality Control

Quiz 10 :

Quality Control

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The amount of inspection needed is governed by the costs of inspection and the expected costs of passing defective items.
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True False
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True

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Attributes need to be measured, whereas variable data can be counted.
Free
True False
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False

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Range charts are used mainly with attribute data.
Free
True False
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False

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Concluding that a process is out of control when it is not is known as a Type I error.
True False
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Low-cost, high-volume items often require more intensive inspection than other types of items.
True False
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The traditional view is that the optimum level of inspection minimizes the sum of inspection costs and the cost of passing defectives.
True False
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A process that exhibits random variability would be judged to be out of control.
True False
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Approving the effort that occurs during the production process is known as acceptance sampling.
True False
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If a point on a control chart falls outside one of the control limits, this suggests that the process output is nonrandom and should be investigated.
True False
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The amount of inspection we choose can range from no inspection at all to inspecting each item numerous times.
True False
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The purpose of statistical process control is to ensure that historical output is random.
True False
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High-cost, low-volume items often require careful inspection since we may have large costs associated with passing defectives.
True False
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Processes that are in control eliminate variations.
True False
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Statistical process control is the measurement of rejects in the final product.
True False
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A lower control limit must by definition be a value less than an upper control limit.
True False
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An R value of zero (on a range chart)means that the process must be in control since all sample values are equal.
True False
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The traditional view is that the optimum level of inspection occurs when we catch at least 98.6 percent of the defects.
True False
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A p-chart is used to monitor the fraction of defectives in the output of a process.
True False
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Range charts and p-charts are both used for variable data.
True False
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An x-bar control chart can only be valid if the underlying population it measures is a normal distribution.
True False
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