SITEMAP ABOUT
MiC Quality

SIX SIGMA GLOSSARY

  PROCESS IMPROVEMENT AND SIX SIGMA
ONLINE COURSES FREE TRIAL SIX SIGMA FAQ BROCHURES LICENSES ENROLL
GLOSSARY
:: Online Courses
:: Free Trial
:: Six Sigma
>> Glossary
>> Calculators
>> Reference Tables
>> Book Reviews
>> Black Belt ASQ
:: FAQ
:: Brochures
:: Licenses
:: Discounts
 
Welcome to MiC Quality Six Sigma Resources
Online Course Instructor
Glen Netherwood
MiC Quality
Online Learning
:: Home ::Six Sigma ::SIX SIGMA GLOSSARY: Mann Whitney Test :: CURRENT STUDENTS LOGIN

[SIX SIGMA GLOSSARY ALPHABETICAL INDEX] [SIX SIGMA GLOSSARY INDEX OF TOPICS]

Mann Whitney Test (Wilcoxon Rank Sum)
 

The Mann Whitney test is the nonparametric version of the two sample t-test; it compares the means of two samples. It tests the hypothesis:

H0 the samples are drawn from populations with equal means
H1 the mean of the population of sample 'm' is [less than/greater than/not equal to] that of sample 'n'

It is similar in concept to the Wilcoxon Signed Rank Test and is also known as the Wilcoxon Rank Sum Test. The test involves:

  • sort the combined results into size order and allocate ranks
  • find the sum 'w' of the ranks of the sample with the smallest number of values (if they both have the same number of values, select either). This is one of the critical values.

For small data sets the critical value is found from published tables. Because the sum of the ranks must be an integer, it is not usually possible to find the exact critical value:

hypothesis
or

 

m number of values in the sample with the least number of values
n number of values in the other sample
μ 1 the mean of the sample containing the smallest number of values

 

 

MiC Quality offers online courses that can help you prepare for the American Society for Quality (ASQ) Certified Six Sigma Black Belt examination.

Try out our courses by taking the first module of the Primer in Statistics free of charge.

  Enroll Now
[SIX SIGMA GLOSSARY ALPHABETICAL INDEX] [SIX SIGMA GLOSSARY INDEX OF TOPICS] [Top]

MiC Quality Courses
:: Six Sigma Primer
:: Primer in Statistics
:: Advanced Statistics
:: Statistical Process Control SPC
:: Advanced SPC
:: Design of Experiments
:: Advanced DOE
:: Measurement Systems Analysis MSA/ Gage R&R
   
Primer in Statistics
FREE First Module
"Introduction to Statistics"

PDF

Primer in Statistics
FREE Reference Booklet

FREE Excel Primer
   
Learn More



 
Copyright 1998-2014 MiC Quality Legal Notices and Privacy Policy