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Control Charts
Process Capability
Definitions
Work It Out
Anything Goes
100

Two main categories of control charts (classified by type of data)

What are Variable and Attribute

100

The ratio of specification to six standard deviations (short term)

What is Cp or Process Capability

100

A graph used to study how a process changes over time

What is control chart

100
What is the UCL? 

x-bar=10

sigma = 0.25

UCL = 10.75
100

A visual snapshot that graphs the frequency of occurrence

What is a Histogram

200

A variable control chart with a small sample size (<5)

What is X-bar Chart

200

Parameters that when equal, indicate that the process is centered

What are Cp and Cpk

200

Usual/natural historical and quantifiable variation within a system

What is Common Cause Variation  

200
What is the LCL?

x-bar = 18.6

sigma = 0.68

LCL = 16.56
200

A chart that displays the number of nonconformances by frequency and with a cumulative percentage curve

What is a Pareto Chart

300

A variable control chart used for slow production rate processes

What is I or X Chart

300

The Cp value that indicates that the tolerance limits are equal to the specification limits

What is 1

300

Qualitative data based on discrete counts

What is Attribute Data

300
If the specifications are 15.8 +/- 0.4 inches, what is the process capability index?

x-bar = 15.2

sigma = 0.218

Cpk = -0.3058

300

The Cp threshold that indicates that the tolerance limits are greater than the specification limits

What is < 1

400

Attribute control chart with pass/fail data and a constant sample size

What is np chart

400

The Cpk value that indicates that the process mean is equal to one of the specification limits

What is 0
400

Limits that define the area 3 standard deviations above and below the center-line/average

What are Control Limits

400

You count the number of voids on each composite part. The spec calls for no more than 20 voids per part and c-bar = 9. What is your UCL of your process?

UCL = 18
400

Attribute control chart with pass/fail data and a variable sample size

What is p Chart

500

Two variables that are used to determine the control limits for all control charts

What are Mean and Standard Deviation
500

The acceptable value of Cp and Cpk

What is ≥ 1.33

500

A principle that states that 80% of defects or problems usually arise from about 20% of the causes

What is The Pareto Principle 

500

Every 100 parts you record how many passed. What is the UCL of your process if np-bar = 10?

LCL = 19
500

If the specifications are 12.2 ± 0.2 inches, what is the process capability index?

x-bar = 12.0

sigma = 0.1

Cpk = 0