reading 11 - example 3 How did they come up with the ratio of cases of positive to negative abnormal returns as 80:52 , 48:24, 11:13 in solution 2 , 3 and 4 respectively.
What study guide are you using? I didn’t see your example in schweser.
This is from the Volume I of the CFAI textbooks, at page 472-3
it is from the CFA material.
Those are just statistics that they are providing as evidence that the hypothesis test was correct in its outcome. They are not calculated from any information given.