Free LSAT Practice Question

Question 1 of 1
ID: LSAT-LR-140
Section: Logical Reasoning
Topic: Principle
Difficulty level: Medium

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Engineer: The Kervaig ladder has run six seasons, long enough to judge any ladder on. It passes nine salmon in ten that reach it; the old ladder passed six. But a pass rate is a rate among the fish that arrive, and half as many now reach it as reached the old. Until I know why, I will not call it better.

Which one of the following principles most helps to justify the engineer's reasoning?

ANo work of engineering should be called better than the work it replaced until it has been watched over as many seasons as the older work was.

BWhere a measure of how well a structure performs and a measure of how much traffic reaches it point in different directions, it is the first of the two that ought to be relied on.

COne who does not know why the population a measure is drawn from has changed cannot treat a rise in that measure as showing that the change which preceded it did any good.

DNo design should be adopted whose effect on how many animals come to it is unknown when it is chosen.

EAn engineer who reports a figure has a duty to report any other figure known to him that bears on it, even one telling against him.

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