FiltersDone

Question type

Essay

Multiple Choice

Short Answer

True False

Matching

Exam 15: Statistical Quality Control

Show Answer

Share

---

All types

Filters

Study FlashcardsPractice ExamLearn

Question 51

Multiple Choice

Review LaterAdd Note

Review Later

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?

A) 0
B) .04
C) .11
D) .13
E) .16

Correct Answer

verified

Show Answer

Question 52

Multiple Choice

Review LaterAdd Note

Review Later

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

A) Define the quality characteristic to be controlled.
B) Determine a quality control point in the process.
C) Eliminate all defects found.
D) Plan how inspection is to be done.
E) Plan corrective action

Correct Answer

verified

Show Answer

Question 53

True/False

Review LaterAdd Note

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

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

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?

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

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

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?

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

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

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?

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 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?

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?

Control limits distinguish between non-random and assignable variability.

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 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?

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?