Some of the students did better on the q1 and q3 area but overall the minimum and maxium are still the same amount so the effect didnt work. The highest grade on the pretest was the same on the post test and likewise with the lowest score so the answer would be C
:Basically it's just using any other random numbers for the ration. For example if the ratio given was 9:15 then it should just be the numbers 9 and 15. So a non example for a ratio for the example given would be 6:18
