FiltersDone

Question type

Essay

Multiple Choice

Short Answer

True False

Matching

Exam 10: Quality Control

Show Answer

Share

---

All types

Filters

Study FlashcardsPractice ExamLearn

Question 61

Multiple Choice

Review LaterAdd Note

Review Later

The process capability index (Cpk) may mislead if: (I) the process is not stable. (II) the process output is not normally distributed. (III) the process is not centered.

A) I and II
B) I and III
C) II and III
D) II only
E) I, II and III

F) A) and B)
G) C) and D)

Correct Answer

verified

Show Answer

Question 62

Multiple Choice

Review LaterAdd Note

Review Later

What is the sample proportion of failures (p) for Prof.D?

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

F) A) and C)
G) All of the above

Correct Answer

verified

Show Answer

Question 63

True/False

Review LaterAdd Note

Attributes need to be measured, variable data can be counted.

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

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

What is the estimate of the mean proportion of failures for these instructors?

If the process is known to produce 11 percent defectives on average, what is the alpha risk (probability of Type I error) for upper and lower control limits of .1256 and .0944 respectively? .1412 and .0788? .1568 and .0632?

What are the .95 (5% risk of Type I error) upper and lower control limits for the p-chart?

Range charts are used mainly with attribute data.

Quality control is assuring that processes are performing in an acceptable manner.

Control limits tend to be wider for more variable processes.

The number of runs up and down for the data above is:

Type I and Type II errors refer to the magnitude of variation from the standard.

Suppose the long-run average of this coating process is 0.09 millimeters.Further suppose this process' standard deviation is 0.015 millimeters.What proportion of the output from this process will fail to meet specifications?

The purpose of statistical process control is to ensure that historical output is random.

Four samples of three observations each have been taken, with actual measurements (in centimeters) shown below.Construct three-sigma mean and range charts.

If the process is known to have a mean of 15 and a standard deviation of 3, what is the alpha risk (probability of Type I error) for upper and lower control limits of 16.5 and 13.5 respectively? 18 and 12? 19.5 and 10.5?

The specifications for a product are 6 mm $\pm$ 0.1 mm.The process is known to operate at a mean of 6.05 with a standard deviation of 0.01 mm.What is the Cpk for this process?

An R value of zero (on a range chart) means that the process must be in control since all sample values are equal.

A process that exhibits random variability would be judged to be out of control.