Chapter 10 Flashcards
What is a type 2 Error?
Wrongly concluding that a process is in contorl when it actually isn’t
Once there is only random variation in the output of the process, the process is considered___________?
Stable
Variability of process output that is measuered in standard deviation
Process width
Limits of range of acceptable variation in output
Specific width
Who said there is cost to any deviation from target specifications?
Genichi Taguchi
How to improve process capability? (5)
- Simplify
- Standardize
- Mistake proof
- Upgrade
- Automate
Process capability 3 improvements…
- Reduce the need for quality control
- Lower cost of quality failures
- Improve customer services
Systematic improvement through documentation measure and analysis is….
BPI Business process improvement
3 BPI steps…
Map process
Analyze process
Redesign Process
What is PDSA
Plan Do Study Act
PDSA, what happens with in the plan phase?
Study, document, collect data, analyze, plan, specific measures
PDSA what happens in the DO phase?
Begin the plan and make any needed changes
PDSA what happens within the study phase?
Evaluate plan and make any more changes
PDSA what happens in the ACT phase?
Standardize and communicate the results
What is DMAIC
Define, Measure, Analyze, Improve, Control
Types of Quality control- Accepted Sampling?
Contorl efforts are limited to before and after the production
Types of Quality Control- What is process control?
Expand efforts to include the entire production and delivery process
Types of Quality Control- what is continuous improvement?
Quality control is integrated into the production
Activity that compares process output to a standard to achieve quality of conformance?
Quality control inspection
What are the four questions of the inspection process?
- Where
- How much/ often
- On site?
- Inspect attributes or variables
What are the three areas where you can do inspections?
End of process
Start of process
During process
Level of inspection activity at which the costs are at its lowest?
Optimal level
When should you use centralized inspection?
When the inspection process requires costly or specialized equipment and persons
When should you use on site inspections?
Typically when the inspection needs to be quick
Inspection techniques that monitor and control process variation and statistical sampling, on a computer?
SPC Statistical Process Control
Type of process variation where the cause can not be identified
Random Variation
Type of process variation where cause can be identified
Non Random Variation
Theoretical basis for distinguishing between types of variation?
Sampling distribution
Most commonly used distribution, aka bell curve?
Normal distribution
States that sampling distribution will approach a normal distribution patter as number of samples taken increase?
Central Limit Theory
Statistical Process Tools- uses control limits and time ordered series of sample statistics to determine variation form process mean is random or non random?
Control chart
What are the 2 SPC Control Charts for Variables?
Mean Control Charts- monitor and control central tendency
Range Control Charts- used to monitor and control dispersion of outputs
Chart that monitors PPProportion of defective times in the output?
P CHARTs
Type of Chart that monitors number of defects of outputs
C Charts
What is a type I Error?
Wrongly concluding that a process is NOT in control when it actually is
