Chap 10 Flashcards Preview

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Flashcards in Chap 10 Deck (24):
1


Statistical Quality Control


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

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Acceptance Sampling


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

3


Statistical Process Control


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

4


Inspection


Apraisal of a good or service against a standard.

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3 Stages of Inspection

A image thumb
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Statistical Process Control Planning Process

A image thumb
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Where to inspect

On Site VS In Lab

A image thumb
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Random Variation


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

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Assignable Variations


A variation whose source can be identified

10


Control chart


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

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Control Limits


The deviding lines between random and non random variations

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Type I Error

Concluding that a process changes whan it has not

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Type II error


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

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5 Steps in designing a control Chart


- 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

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Control Charts for Variables


Sample mean

Monitor the mean of a process

Sample Range

Monitor the dispersion of a process

 

16


Control Charts for attributs


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

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Design Specification


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

 

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Process Variability


Actual variability in a process for a product

 

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Process Capability


The ability of a process to meet design spacifications

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Capability analysis


determins wether the process output falls within the design specifications

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Capable process


The output falls within specifications

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4 possible strategies if a process is incapable


- Redesign process or reduce variability

- Use an alternative process

- use 100% inspection

- Relax design specifications

 

24


six sigma quality


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