Chap 10

Question 1

Statistical Quality Control

Answer 1

Uses statistical techniques and sampling in monitoring and testing of quality of goods and services

Question 2

Acceptance Sampling

Answer 2

It relies primarly on inspection/test of previously produced items. It determins weather to accept or reject a product.

Question 3

Statistical Process Control

Answer 3

It is a statistical quality control that occurs during production. It determins if the process is operating within acceptable limits.

Question 4

Inspection

Answer 4

Apraisal of a good or service against a standard.

Question 5

3 Stages of Inspection

Answer 5

Question 6

Statistical Process Control Planning Process

Answer 6

Question 7

Where to inspect

On Site VS In Lab

Answer 7

Question 8

Random Variation

Answer 8

Natural variations in the output of processes created by countless minor errors

Question 9

Assignable Variations

Answer 9

A variation whose source can be identified

Question 10

Control chart

Answer 10

A time ordered plot of a sample statistic that is used to distinguish between random and assignable variation.

Question 11

Control Limits

Answer 11

The deviding lines between random and non random variations

Question 12

Type I Error

Answer 12

Concluding that a process changes whan it has not

Question 13

Type II error

Answer 13

Concluding that a process is in control when it is actualy not

Question 14

5 Steps in designing a control Chart

Answer 14

• Determine a sample size
• Obtain 20 to 25 samples
• Establish and graph preliminar control limits
• Plot sample stats values on control chart
• if any point are outside the control limits, investigate and correct

Question 15

Control Charts for Variables

Answer 15

Sample mean

Monitor the mean of a process

Sample Range

Monitor the dispersion of a process

Question 16

Control Charts for attributs

Answer 16

p-Chart

• Measure the proportion of deffects in a process
• from a binomial distribution: measure success or failure

c-Chart

• Measurs the number of deffect per unit
• From a poisson distribution

Question 17

Design Specification

Answer 17

A range of acceptable values established by engineering design or customer requierment

Question 18

Process Variability

Answer 18

Actual variability in a process for a product

Question 19

Process Capability

Answer 19

The ability of a process to meet design spacifications

Question 20

Capability analysis

Answer 20

determins wether the process output falls within the design specifications

Question 22

Capable process

Answer 22

The output falls within specifications

Question 23

4 possible strategies if a process is incapable

Answer 23

• Redesign process or reduce variability
• Use an alternative process
• use 100% inspection
• Relax design specifications

Question 24

six sigma quality

Answer 24

A more advance version of problem solving/ Continuous improvement. It also refers to the goal of acheiving process variability so small that the half width of the design specification is 6 sigma