Lecture 13

Question 0

P chart

Answer 0

Fraction nonconforming

Question 1

Attribute Charts

Answer 1

Assist in monitoring processes providing a goods or services.
P, np, percent nonconforming, c, and u charts

Question 2

np Chart

Answer 2

Number nonconforming

Question 3

C chart

Answer 3

Counts of nonconformities.

Question 4

U charts

Answer 4

Nonconformities per unit

Question 5

Fraction Nonconforming

Answer 5

Ratio of the nonconforming items in a population to the

total number of items in that population.

Question 6

A quality characteristic follows a binomial distribution if:

Answer 6

1. All trials are independent.
2. Each outcome is either a “success” or “failure”.
3. The probability of success on any trial is given as p. The probability of a failure is 1-p.
4. The probability of a success is constant.

Question 7

Trial Control Limits

Answer 7

Control limits that are based on a preliminary set of data

Question 8

Attributes vs. Variables Control Charts

Answer 8

Attributes data is easy to collect.
Variables data can be more informative.
Variables control charts provide an indication of impending trouble.
Attributes control charts will not react unless the process has already changed.

Question 9

Guidelines for Implementing Control Charts

Answer 9

Determine which process characteristics to control.
Determine where the charts should be implemented in the process.
Choose the proper type of control chart.
Take action to improve processes as the result of SPC/control chart analysis.
Select data-collection systems and computer software.