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Exam 10: Quality Control

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Question 21

True/False

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The best way to assure quality is to use extensive inspection and control charts.

A) True
B) False

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Question 22

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The output of a process may not conform to specifications even though the process may be statistically "in control."

A) True
B) False

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Question 23

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A quality analyst wants to construct a sample mean chart for controlling a packaging process. He knows from past experience that whenever this process is in control, package weight is normally distributed with a mean of 20 ounces and a standard deviation of two ounces. Each day last week, he randomly selected four packages and weighed each If he uses upper and lower control limits of 22 and 18 ounces, on what day(s) , if any, does this process appear to be out of control?

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

Approximately 99.7 percent of sample means will fall within plus or minus two standard deviations of the process mean if the process is under control.

Run tests give managers an alternative to control charts; they are quicker and cost less.

A quality analyst wants to construct a sample mean chart for controlling a packaging process. He knows from past experience that whenever this process is in control, package weight is normally distributed with a mean of 20 ounces and a standard deviation of two ounces. Each day last week, he randomly selected four packages and weighed each What is the sample mean package weight for Thursday?

High-cost, low-volume items often require careful inspection since we may have large costs associated with passing defectives.

The range chart ( R-chart) is most likely to detect a change in

The amount of inspection needed depends on _____ and _____.

C_pk can be used only when the process is centered.

Which of the following quality control sample statistics indicates a quality characteristic that is an attribute?

The greater the volume of the process being targeted for inspection, the more attractive _____ inspection is.

The purpose of quality control is making sure that processes are performing in an acceptable manner.

A quality analyst wants to construct a sample mean chart for controlling a packaging process. He knows from past experience that whenever this process is in control, package weight is normally distributed with a mean of 20 ounces and a standard deviation of two ounces. Each day last week, he randomly selected four packages and weighed each What is the mean of the sampling distribution of sample means when this process is in control?

Consider the following information The number of runs up and down for the preceding data is

The Taguchi loss function suggests that the capability ratio can be improved by extending the spread between LCL and UCL.

The amount of inspection we choose can range from no inspection at all to inspecting each item numerous times.

A quality analyst wants to construct a control chart for determining whether four machines, all producing the same product, are in control with regard to a particular quality attribute. Accordingly, she inspected 1,000 units of output from each machine in random samples, with the following results For upper and lower control limits of .026 and .014, which machine(s) , if any, appear(s) to be out-of-control for process proportion of defectives?

Control limits used on process control charts are specifications established by design or customers.