Non-Parametric: Wilcoxon Rank Sum Flashcards
(5 cards)
1
Q
What are the hypotheses for Rank Sum?
A
H⁰:ŋx=ŋy
H¹:ŋx≠ŋy
ŋx>ny
ŋx<ny
2
Q
How to find TS of Rank Sum?
A
- Rank data as one set
- Calc. rank total for each set
- Use U formulae to calc. U statistics for each set (U= T - [n(n+1)]÷2)
- TS is smaller U value
3
Q
How to find CV for Rank Sum?
A
Table 11 in equation booklet
4
Q
Assumptions for Rank Sum?
A
- Two sets unpaired data
- Data follows no known distribution
- Samples taken randomly
- Samples taken independently
- Data symmetrical around median
5
Q
What is the Rank Sum test AKA?
A
Mann-Whitney U test
