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# It s very hard to determine correctly the efficiency of new

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It s very hard to determine correctly the efficiency of new [#permalink]

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08 Jun 2013, 04:49
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Difficulty:

55% (hard)

Question Stats:

52% (02:07) correct 48% (01:20) wrong based on 94 sessions

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It’s very hard to determine correctly the efficiency of new machines offered to manufacturers. For example, a new machine producing cartridge cases is considered efficient if it can produce a large number of cartridge cases in a short time. Does this prove the efficiency of the machine? What if a significant portion of the cartridge cases it produces is defective?

The implied objection to the above measure of machine efficiency is based on questioning which of the following statements?
(A)Producing cartridge cases is the primary purpose of the machine discussed in the passage.

(B)The number of cartridge cases produced in a certain amount of time by a cartridge case machine is relevant to determining machine’s efficiency.

(C)Machines producing cartridge cases are representative of all other machines.

(D)The quality of the product produced can be ignored when determining the time efficiency of a certain machine.

(E)The quality of the product may decrease when the quantity of the product produced in a certain amount of time increases.
[Reveal] Spoiler: OA

Last edited by guerrero25 on 08 Jun 2013, 08:20, edited 1 time in total.
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Re: It’s very hard to determine correctly the efficiency of new [#permalink]

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08 Jun 2013, 05:08
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It’s very hard to determine correctly the efficiency of new machines offered to manufacturers. For example, a new machine producing cartridge cases is considered efficient if it can produce a large number of cartridge cases in a short time. Does this prove the efficiency of the machine? What if a significant portion of the cartridge cases it produces is defective?

The implied objection to the above measure of machine efficiency is based on questioning which of the following statements?

We have to take a statement that is questioned by the objection. This objection states that "quantity" is not the only factot that determines efficiency.
So the relationship "quantity=>efficiency" is not correct in the objection, also the quality must be taken into consideration:

(D)The quality of the product produced can be ignored when determining the time efficiency of a certain machine.

This statement is questioned, it clearly states what we said before.
D
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Re: It’s very hard to determine correctly the efficiency of new [#permalink]

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08 Jun 2013, 12:14
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Choice D is best.

Same logic as in post man delivering letters - increase in effciency may lead to poor quality.
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Re: It’s very hard to determine correctly the efficiency of new [#permalink]

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09 Jun 2013, 01:18
This is evaluation question, my approach is "variation technique" that is presented in Power Score CR - Bible.

The question stem is quite convoluted, but we can paraphrase it like "which of the following statement can be used to evaluate the measure of machine efficiency?"

The basic idea of "variation technique" is adding YES/NO to each answer. If YES/NO does not change anything ==> The answer is wrong. But if YES/NO can change the part you want to evaluate ==> The answer is correct.

KEY point is "QUALITY", so stick to the options that mention quality.

(A)Producing cartridge cases is THE PRIMARY PURPOSE / NOT THE PRIMARY PURPOSE of the machine discussed in the passage.
Clearly, YES/NO does not affect the objection to the measure of machine efficiency ==> A is wrong.

(B)The number of cartridge cases produced in a certain amount of time by a cartridge case machine is RELEVANT / NOT RELEVANT to determining machine’s efficiency.
Clearly, YES/NO does not affect the objection to the measure of machine efficiency ==> B is wrong

(C)Machines producing cartridge cases are REPRESENTATIVE / NOT REPRESENTATIVE of all other machines.
Clearly, YES/NO does not affect the objection to the measure of machine efficiency ==> C is wrong

(D)The quality of the product produced CAN BE IGNORED / CANNOT BE IGNORED when determining the time efficiency of a certain machine.
If the quality can be ignored ==> the more products, the more efficiency
If the quality must be considered ==> the more products does not mean the more efficiency, cause we have to consider how many defects.
D is correct.

(E)The quality of the product MAY DECREASE / MAY NOT DECREASE when the quantity of the product produced in a certain amount of time increases.
Clearly, YES/NO does not affect the objection to the measure of machine efficiency ==> E is wrong

Hope it helps.
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Re: It’s very hard to determine correctly the efficiency of new   [#permalink] 09 Jun 2013, 01:18
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# It s very hard to determine correctly the efficiency of new

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