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Question
QuickView
Choices
Curve Question
Difficulty
Psg/Game/S
Difficulty
Explanation
PT2 S4 Q05
+LR
Weaken +Weak
A
3%
154
B
87%
160
C
4%
153
D
3%
153
E
4%
156
120
129
146
+Easiest 145.613 +SubsectionMedium

Here we have a weakening question, indicated by: Which one of the following, if true, would tend to invalidate use of the ratings for the agency’s purpose?

So we’ve got a government rating system where the highest ranked airlines are the ones with the lowest proportion of late flights. So the number one airline would be the one whose ratio of total flights to late flights is the lowest. From the question stem, we know we want to weaken the agency’s reasoning for why this rating would be good for their purpose. We’re next told what this purpose is; the agency thinks the rating can establish an objective measure of the efficiency of the airlines personnel in meeting flight schedules. So the conclusion we want to weaken here is that the proportion of late flights actually represents how efficient the staff of each airline are. We can think of this as hypothesis; the agency believes the reason airlines have more or less late flights is the efficiency of their staff. A good answer choice will be one which introduces an alternate explanation for why airlines are late. On to the answers:

Answer Choice (A) Ok, but this wouldn’t affect whether the staff are what determine flights being late.

Correct Answer Choice (B) If flights are often made late by weather, and some airlines are more affected than others, then it is unlikely the rating would be representative of staff performance because a lot of the time it’s out of their control.

Answer Choice (C) This gives us a reason why being late isn’t always the end of the world, but has no bearing on whether the lateness of flights reflects staff performance.

Answer Choice (D) This is totally compatible with what we want to weaken.

Answer Choice (E) Who cares how we define a late flight? Our interest is in whether lateness represents inefficiency on the part of flight staff.