Mann Whitney

Question 1

What do the following stand for?
U1 U2 n1 n2 R1 R2

Answer 1

U1 - statistic for group A U2- statistic for group B
n1- number of values in group 1 n2- number of values in group 2
R1- sum of ranks for group A R2- sum of ranks for group B

Question 2

Step 1?

Answer 2

Rank the scores from lowest to highest regardless of group

Question 3

Step 2?

Answer 3

Add up the ranks for each group

Question 4

What is the equation used in step 3?

Answer 4

R1= n1(n1+1)/2
Substitute values into the equation for groups 1 and 2

Question 5

Step 4?

Answer 5

Make note of U values
Select the smallest one

Question 6

Step 5?

Answer 6

Compare observed value with critical value
Result is significant if u value is equal or less than the critical value