Independant design: Mann-Whitney U test
1. Rank score for all ppts
2. Calculate sum of all the ranks for each group seperately
3. Use formula to calculate Ua for each group
4. Smallest number is the observed value of U
Repeated Measures: Wilcoxon test - used as a test of difference between two conditions when data is ordinal
1. Calculate differnece in scores from each condition, and rank the differences.
2. Calculate sum of the ranks for positive differences, then sum for negative differences
3. T value is the smallest number
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