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Bartlett’s Test is a hypothesis test that determines whether a statistically significant difference exists between the variances of two or more independent sets of normally distributed continuous data. It is useful for determining if a particular strata or group could provide insight into the root cause of process issues.

An example would be if Assembly Line A product weights have a variance of 1 gram, Assembly Line B product weights have a variance of 2 grams and Assembly Line C product weights have variance of 2.5 grams and you want to determine if any of the 3 lines truly has less/more variation than the others or if the difference is just due to random chance.

For a better understanding of the Bartlett’s Test, check out our Black Belt Training & Certification Course!

Elisabeth Swan

Elisabeth is a Managing Partner & Executive Advisor at GoLeanSixSigma.com. For over 25 years, she's helped leading organizations like Amazon, Charles Schwab and Starwood Hotels & Resorts build problem-solving muscles with Lean Six Sigma to achieve their goals.

Tracy O'Rourke

Tracy is a Managing Partner & Executive Advisor at GoLeanSixSigma.com. She is also a Lean Six Sigma Green Belt Instructor at University of California San Diego and teaches in San Diego State University’s Lean Enterprise Program. For almost 20 years, she has helped leading organizations like Washington State, Charles Schwab and GE build problem-solving muscles.