Hi everybody,
This question is such a masterpiece that I thought I should post my 2 cents for those who still didn't get what the Q is basically talking about.
Pls refer the figure I attached:
Case I is the situation presented in the Q i.e. it represents
the motorcyclists involved in a serious motorcycle accidentCase II and III represents those
motorcyclists who NEVER involved in a serious motorcycle accidentFirstly, we have to consider those motorcyclists too who NEVER involved in a serious motorcycle accident, in order to recommend that the course would basically reduce the no. of serious motorcycle accidents.
Now, look at hypothetical
case II, in which we see that only 9% motorcyclists took the course and the rest 91% didn't care. In this situation can we really say that
more the motorcyclists take the course less the no. of serious accidents. NO, it seems the courses actually do not any role to prevent motorcyclists from serious accidents. So, conclusion doesn't hold here.
Now consider hypothetical
case III, clearly the training made the difference here and we should recommend the course. In other words
the conclusion is true. Note that for the case III to be true, overall,
significantly more than eight percent of motorcyclists have taken a motorcycle-safety course. This is nothing but choice A.
I know we can't afford to think or draw in such details during GMAT but, this is to show you the level of thinking required by this kind of Qs. I prefer diagrams over words, so it was easy for me to think this way. Experts, pls correct my mistakes.
Attachment:
IMG_20151106_181457.jpg [ 3.49 MiB | Viewed 80320 times ]
P.S. Sorry for the totally unprofessional diagram :wink: