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Capability
General Concepts Part 1
MSA
General Concepts Part 2
100

True or False: If CpK is less than 1, process is considered capable?

False

100

Before you perform the capability study, what test would you need to run first?

Normality Test

100

What does MSA stand for?

Measurement Systems Analysis

100

Name 3 Minitab features

Possible Answers: 

Basic Statistics

Measurement Systems Analysis (MSA)

Process Capability Statistical Tolerance Limits (Tolerance Intervals)

Control Charts

Sampling Plan / Sample Size

Statistical Process Control (SPC)

Design of Experiment

Hypothesis Testing and Analysis of Variance

Reliability Predictions

200

How are specification limits different from control limits?

Control limits = calculated from process data and represent how your process is actually performed

Specification limits = defined by your customer and represent desired performance of your process

200

What is the shape of a normal distribution graph?

Symmetrical and unimodel; also called bell-shaped or Gaussian distribution

200

Which GR&R study was presented in today's training?

a. Crossed

b. Nested 

c. Linear

d. Expanded


a. Crossed

200

What are the possible types of data?

Variable and Attribute


300

For what value of Ppk would the process NOT be considered capable?

A. 0.05

B. 1.0

C. 1.05

D. 2

A. 0.05

300

What is normal data?

Data that when drawn comes from a population that has a normal distribution

300

Multiple choices: What are the sources of process variation?

a. Part-part variation

b. Gauge-gauge variation

c. Measurement system variation

d. Procedures and software variation 

a. Part-part variation

c. Measurement system variation

300

What are some examples of variables and attributes? (List 1 example of each)

Variables:

  • Continuous data

  • Data can be divided

  • Can have decimal places

Examples

  • PSI

  • Inches

  • Pounds force


Attributes:

  • Discrete data

  • Data cannot be divided

  • Cannot have decimal places

Examples

  • Pass / Fail

  • Go / No Go

  • Yield 

  • Ordinal data


400

What is the difference between Cpk and Ppk?

Cpk is normal distribution whereas Ppk is non-normal distribution

400

Why is the shape of a normal distribution graph also called the gaussian distribution?

Because it was named after its inventor Carl Friedrich Gauss

400

Ture or False: Repeatability is the variation due to the measurement system. It is the variation that is observed when different operators measure the same part many times, using the same gage, under the same conditions.

False: Reproducibility

Reproducibility can be split into two sources:

  • Operator: The variability in measurements due to different operators.
  • Operator-by-Part: The variability in measurements due to different operator/part combinations after considering part and operator separately.
400

If P-Value is higher than 0.05, would you consider it a normal distribution?

Yes

500

For performing capability studies at non-normal data, how would you determine which distribution to use?

A. Select transformation with P-value less than 0.05

B. Select transformation with the fewest P-value

C. Select transformation with P-value greater than 0.05

D. Select the transformation with the greatest P-value

C & D- Select the transformation with P-value greater than 0.05 or with the greatest P-value. 

500

True or False: 68.27% of the population fall between   μ ± 2σ  

False!

It should be μ ± 1σ  

500

What Percent TOL of the Gage is considered acceptable?

a. Less than 15%

b. Less than 20%

c. Less than 25%

d. Less than 30%

b. Less than 20%

500

What is process tolerance?

The amount of variation that a part can have and still meet the customer's requirements. It is the difference between the upper specification and the lower specification.

For example, for an upper specification of 0.36 mm and a lower specification of 0.34 mm, the process tolerance is 0.02 mm.