If a motor is sound-insulated

Answer choices

1. A

   Reversed Logic4% picked this

   If a motor can be used in institutional settings, then it

   We know this: insulated → quiet enough → used in institutional This answer is acting like we know this: used in institutional → insulated That's moving illegally backwards.

   4%
2. B

   Correct59% picked this

   None of the motors manufactured by EM Industries

   Why this is right

   The last sentence says manufactured → not quiet enough by EM Industries for home appliances The first sentence says not quiet enough → not sound for home appliances insulated If we put those two ideas together, we get made by → not quiet → not sound EM enough 4 home insulated

   Skill tested: Must be True · how this choice captures the argument's function is the move to repeat next time.

   59%
3. C

   Almost Contradicted2% picked this

   At least some of the motors manufactured by EM Industries can be used

   The only way we have available to prove that something can be used in institutional settings is to establish that "it's quiet enough to use in home appliances". But we were told that none of the EM motors are quiet enough to use in home appliances, so we don't have any way to prove that they can be used in institutional settings. Some people may have picked this out of confusion based on our chain: can't be used → not quiet enough → not sound in instit. settings for home apps insulated But there's no way to derive that some EM motors (all of which are not quiet enough) can be used in institutional settings.

   2%
4. D

   Reversed Logic4% picked this

   If a motor is quiet enough to use in home appliances, then

   This just reads the first sentence in an illegal backwards motion. Given If Don is in Texas, then Don is in America. that doesn't prove that If Don is in America, Don is in Texas. We were told if sound insulated, then quiet enough and this answer is pretending we can derive if quiet enough, then sound insulated

   4%
5. E

   Opposite Logic30% picked this

   None of the motors manufactured by EM Industries can be used

   We weren't given any way to prove that something can't be used in institutional settings, only a way to prove that something can be used. We might pick this out of confusion about what we can infer out of the contrapositive chain: can't be used → not quiet enough → not sound in instit. settings for home apps insulated Given a chain like, ~A → ~B → ~C If we say "none of the motors from EM are B", then we can say motor from EM → ~B → ~C But we can't infer anything backwards to know anything about A. We know that none of the EM motors are quiet enough, but this answer is assuming that "if you're not quiet enough, then you can't be used in institutional settings". We were only told, "if you are quiet enough, then you can be used".

   30%