Statistical Tests

1. Mann Whitney U: Ollie Is Mean

Use if you've got ORDINAL data and INDEPENDENT MEASURES DESIGN.

• Rank the numbers in each column from lowest to highest. If some numbers are the same then give them the middle value of ranking.
• Add up all the ranks in condition 1= R1
• Repeat for condition 2= R2
• Use formula to find U value (formula will be provided), use the lowest R value for this.
• Find the critical value from the table provided. 
• The results are significant if the calculated value (U value)is less than the critical value. If so, you reject the null hypothesis.

2. Wilcoxon Signed Rank Test: Ollie Runs Wild

Use if you've got ORDINAL data and REPEATED MEASURES DESIGN. 

• Rank the differences in order of lowest to highest, ignoring the positive/ negative signs and values of 0. Do the same as in the other tests if the values are the same.
• Count how many positive figures and how many negative figures there are.
• Add scores of ranked difference if it has the less frequent sign (+/-).
• n= number of differences (aka number of participants unless they scored…