Hi
The statistical difference problem at 23:00 seems to have the wrong answer.
Expressed in terms of J, the increase should be:
(original - difference / original ) ( 100)
The only reason answer D works out is because original = 100 - J with the plugged in numbers provided by the Princeton Review explainer.
More generally, a formula for the answer needs to rely upon a reference point expressed without J.
The statistical difference problem at 23:00 seems to have the wrong answer.
Expressed in terms of J, the increase should be:
(original - difference / original ) ( 100)
The only reason answer D works out is because original = 100 - J with the plugged in numbers provided by the Princeton Review explainer.
More generally, a formula for the answer needs to rely upon a reference point expressed without J.