http://en.wikipedia.org/wiki/Simpson’s_paradox

The real life situation is that your dad is in Homer’s position…

I have no idea really

Hope this answer is at least good for half a smile though…

Good luck

The Simpson’s paradox occurs when the percentage of questions done by person B is GREATER than that of person A although on both days person A completes a greater percentage of his homework.

How?

On Monday person A gets 10 questions and he does 5.

Person B gets 100 and he does 40.

On Tuesday person A gets 100 questions and he does 30.

Person B gets 10 and he does 2.

So, combining the number of questions did on both days (both of them gets 110 questions), Person A completes 35 questions while person B 42. Person B manage to do more even though on both days the percentage of questions he completed is less than that of person B.

Hope this helps!