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Exam 15: Statistical Quality Control

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Question 51

Multiple Choice

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A shift in the process mean for a measured quality characteristic would most likely be detected by a(n) :

A) p-chart
B) x-bar chart
C) c-chart
D) R-chart
E) s-chart

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Question 52

Multiple Choice

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A Quality Analyst wants to construct a control chart for determining whether three machines,all producing the same product,are under control with regard to a particular quality variable.Accordingly,he sampled four units of output from each machine,with the following results: What is the estimate of the process mean based on this limited number of samples?

A) 16
B) 19
C) 20
D) 21
E) 23

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Question 53

Multiple Choice

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A Quality Analyst wants to construct a control chart for determining whether four machines,all producing the same product,are under 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: What is the sample proportion of defectives for machine #1?

Control limits distinguish between non-random and assignable variability.

Given the following process control data for a quality attribute (three samples of size 400 each): If the process proportion of defectives is unknown,what is the alpha risk (probability of Type I error)for upper and lower control limits of .115 and .085 respectively? .13 and .07? .145 and .055?

The Chair of the Operations Management Department at Quality University wants to construct a p-chart for determining whether the four instructors teaching the basic P/OM course are under control with regard to the number of students who fail the course.Accordingly,he sampled 100 final grades from last year for each instructor,with the following results: What is the sample proportion of failures for Prof.D?

When using control charts sample frequency is important Sampling frequency can be a function of the ______ of a process and the _____ to sample.

Control limits are specifications established by engineering design or customer requirements.

Low-cost,high-volume items typically require relatively low levels of inspection.

A c-chart is used to monitor the number of defectives in the output of a process.

A Quality Analyst wants to construct a control chart for determining whether four machines,all producing the same product,are under 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: What is the estimate of the process proportion of defectives based on the samples for these four machines?

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 under control,package weight is normally distributed with a mean of twenty ounces and a standard deviation of two ounces.Each day last week,he randomly selected four packages and weighed each with the following results: What is the sample mean package weight for Thursday?

Statistical process control is based on comparing periodic samples from a process to predetermined limits.

Given the following process control data for a normally distributed quality variable (three samples of size four each): What is the sample mean for sample #1? #2? #3?

A Quality Analyst wants to construct a control chart for determining whether three machines,all producing the same product,are under control with regard to a particular quality variable.Accordingly,he sampled four units of output from each machine,with the following results: What is the sample mean for machine #1?

Which of the following is not a step in the quality control planning process?

Given the following process control data for a quality attribute (three samples of size 400 each): If the process proportion of defectives is unknown,using .10 alpha risk control limits,do any of the sample proportions indicate an out-of-control process proportion of defectives?

Typically the production of high-cost,low-volume items require little quality control inspection.

Which of the following quality control sample statistics measures a quality characteristic which is an attribute?

A c-chart is used to monitor the number of defects per unit of a process output.