Symbols & Acronyms
x-bar
What is the mean(or average)?
This graph is used to show the distribution of a variable
What is a Histogram?
Statistical concept that represents how much variation there is in a process relative to customer specifications
What is Process Sigma?
Variation that can be sporadic
What is special cause variation?
Sum all the numbers and divide by the total
What is the mean (or average)?
DPMO
What is Defects per Million Opportunities?
Determine relative importance or impact of different categories
What is a Pareto Chart?
6210 DPMO
What is the level of DPMO in a 4 Sigma process?
Limits that are set by the customer
What are specification limits?
The difference between the maximum and minimum value
What is the range?
d
What is precision?
This graph is like a control chart EXCEPT it has no control limits
What is a run chart (or time plot)
The assumption that must be met to calculate Process Sigma using Method 2
What is the data must be Normally distributed?
Measurement to determine if a data set is Normally distributed
What is the KS Test p-value?
After rank ordering the data, it is the middle number
What is the median?
FPY
What is First Pass Yield?
A frequency plot that appears like two processes are occurring
What is a bi-modal distribution?
This Method is used to calculate process sigma by using the normal approximation
What is Method 2?
233 DPMO
What is the level of DPMO in a 5 sigma process?
The average of all the ranges
What is R-bar?
Z-value
What is the measure (formula) to standardize a normal distribution?
Histogram, Dot Plot, Stem-and-Leaf Plot
What are the types of Frequency Plots?
1.5
What is the "shift" defined to convert long-term data into a short term Process Sigma?
It is also called the 80/20 rule
What is the Pareto Principle?
The square root of the variance
What is the standard deviation?