Free LSAT Practice Question

Question 1 of 1
ID: LSAT-LR-008
Section: Logical Reasoning
Topic: Flaw in the Reasoning
Difficulty level: Easy

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Of the Tarnwick households that installed roof insulation last year, seventy percent report lower heating costs this winter. Of those that did not install insulation, only thirty percent report lower costs. Both groups were surveyed in the same week and asked the same questions. Insulation therefore lowers heating costs for most households that install it.

The argument is most vulnerable to criticism on the grounds that it

Aconfuses the proportion of households reporting lower costs with the amount by which those costs actually fell, and so with the size of the saving

Boverlooks the possibility that households choosing to insulate differ in other ways that bear on heating costs

Cdraws a conclusion about households everywhere from evidence gathered in a single town and over the course of a single winter

Dassumes that this winter was no colder in Tarnwick than the winter before, and so that a fall in reported heating costs can be credited to the insulation rather than to the weather

Etreats a correlation between insulation and lower costs as showing that the lower costs are what caused the insulation

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