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7 years ago in Algorithms By Riya N
Assumptions for null hypothesis
Hello all! I want to use Mann-Whitney U test to test the null hypothesis. Is there any assumptions that needs to be considered while conducting this test? And also can someone tell me the basic formula used here? Thanks in advance!
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By Parul Singh Answered 7 years ago
The dependent variable should be measured on an ordinal scale or a continuous scale.
The independent variable should be two independent, categorical groups.
Observations should be independent. i.e there should be no relationship between the two groups or within each group.
Observations are not normally distributed.
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By Rajiv Bhatia Answered 7 years ago
U = R1 – n1 (n1+1)/ 2 or U = R – n2( n2+1)/2
R is the sum of the ranks of the sample and n is the number of items in the sample.
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By Lalit Mudra Answered 7 years ago
1. The sample drawn from the population is random.
2. Independence within the samples and mutual independence is assumed. That means that an observation is in one group or the other .
3. Ordinal measurement scale is assumed.
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