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Tackling a GMATPrep CR Evaluate Problem

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Tackling a GMATPrep CR Evaluate Problem  [#permalink]

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22 Feb 2017, 08:47
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Tackling a GMATPrep CR Evaluate Problem

- Manhattan GMAT

This week, we’re going to discuss Evaluate critical reasoning problems. Evaluate what? We’re trying to evaluate an assumption the author uses to draw a conclusion, so these Evaluate questions are a subset of the Assumption Family of questions.

Let’s say we’re given this argument:

In order to increase its profits, MillCo plans to reduce costs by laying off any non-essential employees.

Does that sound like a good plan? Profits equal revenues minus costs. What’s MillCo assuming in claiming that laying off non-essential employees will result in increased profits? For one thing, MillCo is assuming that revenues won’t drop as much as or more than the expected cost savings; if that occurred, MillCo’s profits wouldn’t increase.

An Evaluate question might say something like what would be most useful to know in order to evaluate MillCo’s plan? A correct answer might read:

Whether revenues will be affected adversely enough to threaten MillCo’s profit structure.

Let’s say that answer is no: MillCo’s revenues won’t be affected adversely enough. In that case, MillCo’s argument is strengthened. If, on the other hand, the answer is yes, MillCo’s revenues will be affected adversely enough, then MillCo’s argument is weakened. This answer, then, is designed to test the assumption; it helps to determine whether the assumption is valid. It does not tell us, however, that the assumption definitely is, or is not, valid.

We can pretend we’re scientists testing a hypothesis “ we devise some test to help us determine whether the hypothesis is more or less likely to be true. The author’s claim is the hypothesis. The correct answer should be structured in such a way that there are at least two possible paths “ one direction will make the argument a little more likely to be true (validate the hypothesis) and the other direction will make the argument a little less likely to be true (invalidate the hypothesis).

The incorrect answers will also be presented in this two paths format, with one key distinction: whether the response to the answer is “yes” or “no” makes no difference at all to the claim we’re trying to test. What if we had this answer choice?

Whether MillCo might reduce its costs by eliminating any contract workers.

If MillCo can reduce costs by eliminating contract workers, that doesn’t tell us anything more about whether laying off non-essential employees will help to increase profits. If, on the other hand, Millco cannot reduce costs by eliminating contract workers we still don’t know anything more about whether the plan regarding the employees will work.

This answer choice is trying to distract us by offering a different way to increase profits but we aren’t asked to find alternate ways to increase profits. We’re asked to evaluate whether the existing argument is valid.

Tackle this GMAT Prep problem under 2 mins

Columnist: People should avoid using a certain artificial fat that has been touted as a resource for those whose medical advisers have advised them to reduce their fat intake. Although the artificial fat, which can be used in place of fat in food preparation, has none of the negative health effects of fat, it does have a serious drawback: it absorbs certain essential vitamins, thereby preventing them from being used by the body.

In evaluating the columnist’s position, it would be most useful to determine which of the following?

(A) Whether increasing one’s intake of the vitamins can compensate for the effects of the artificial fat

(B) Whether the vitamins that the artificial fat absorbs are present in foods that contain the fat

(C) Whether having an extremely low fat intake for an extended period can endanger the health

(D) Whether there are any foods that cannot be prepared using the artificial fat as a substitute for other fats

(E) Whether people are generally able to detect differences in taste between foods prepared using the artificial fat and foods that are similar except for the use of other fats

Step 1: Identify the Question

First, we read the question stem:

In evaluating the columnist’s position, it would be most useful to determine which of the following?

The key identifying language is pretty straightforward on this one: in evaluating and most useful to determine. This language reflects an Evaluate problem type.

Step 2: Deconstruct the Argument

In this argument, the first sentence tells us an opinion: the columnist thinks we shouldn’t use this artificial fat. The second sentence tells us two facts, but these facts are competing “ they’re not on the same side. First, the columnist acknowledges that the artificial fat doesn’t have any of the bad effects of real fat, BUT it does have its own bad effect: it prevents us from absorbing certain essential vitamins.

Your notes might look something like this (though there are lots of ways to write notes!):

C: don’t use AF ©
AF > real fat in some ways
BUT AF prevents absorb some vit

Note that I used abbreviations. AF = artificial fat. The c with the circle around it indicates the conclusion. I used the greater than symbol to mean better than.

What does this mean in normal, non-GMAT language? The columnist knows that this fat has a serious drawback and therefore concludes we just shouldn’t use it. What’s the columnist assuming? That there’s no way to fix or get around that drawback “ if there were, then maybe we wouldn’t have to avoid using the artificial fat.

Step 3: State the Goal

As we discussed earlier, our goal here is to find a two-path statement that will test one of the author’s assumptions. If that assumption is valid, then the argument will be at least a little bit stronger. If the assumption is not valid, then the argument will be at least a little bit weaker.

We haven’t discussed this yet, but we’d also want to remind ourselves what kinds of tempting traps we’re likely to see on questions of this type. Evaluate traps typically address some part of the premises but don’t actually address the conclusion, or they try to address some alternate way of reaching the conclusion. The answers look like they’re relevant (because they address something in the argument) “ but they don’t actually address the right thing: what additional information could help to test some assumption that is already in the argument.

Step 4: Work from Wrong to Right

(A) Whether increasing one’s intake of the vitamins can compensate for the effects of the artificial fat
If the answer is yes: then we could eat the AF and still get our vitamins. That weakens the columnist’s claim.

If the answer is no: then the columnist’s claim is a little bit better. Possibly there’s still another work-around that’ll let us eat the AF and still get our vitamins, but a no answer here knocks down one possible way.

This one looks good so far; leave it in.

“(B) Whether the vitamins that the artificial fat absorbs are present in foods that contain the fat”
Think of a real-life scenario here. I use olive oil to cook vegetables, meat, pretty much anything in a pan. So let’s say that I replace my olive oil with a new oil product that contains this artificial fat instead.

If this new oil product also contains the necessary vitamins, that’s bad: now I can’t absorb them. So the columnist is probably right that I shouldn’t use this new oil.

What if the oil doesn’t contain those vitamins, though? Then it doesn’t matter and I can use this new oil, right?

Oh, wait. Am I eating that cooking oil all by itself? No, of course not; I’m using it to cook other foods! Okay, so if any of those foods contain the necessary vitamins, not just the oil, then the columnist is still right: it’s not a good idea to use this oil made from the artificial fat.

It doesn’t actually matter whether the vitamins are present in the specific food made with the replacement fat. As long as you eat more than one thing at once (which is what people tend to do!), you’re affecting your ability to absorb these vitamins—and the columnist’s argument is strengthened. Cross this one off; it doesn’t both strengthen and weaken the argument.

“(C) Whether having an extremely low fat intake for an extended period can endanger the health”
If the answer is yes: then people should make sure not to have extremely low fat intake but wait how does artificial fat play into this? I’m not sure. Nor does the argument indicate anything about extremely low fat intake. The argument only talks about people who need to reduce their fat intake.

If the answer is no: then people don’t have to worry about getting enough fat but again, this whole artificial fat and vitamin thing isn’t impacted at all here.

Cross this one off.

“(D) Whether there are any foods that cannot be prepared using the artificial fat as a substitute for other fats”
If the answer is yes: then people won’t be able to have the AF in those foods. So what? The argument doesn’t claim that all foods have to be able to be prepared with this AF stuff.

If the answer is no: then people can have AF in anything that contains regular fat. Again, so what?
Cross this one off.

“(E) Whether people are generally able to detect differences in taste between foods prepared using the artificial fat and foods that are similar except for the use of other fats”
If the answer is yes: then people might be less likely to use the AF if it tastes funny (or more likely if it tastes better!). But that doesn’t affect whether we’re getting our vitamins.

If the answer is no: then people won’t know whether something contains the AF or regular fat. But that doesn’t address the issue about the vitamins and whether people can still get the vitamins they need if they eat food with AF in it.

Cross this one off. The correct answer is A.

Key Takeaways for Solving Evaluate CR Problems:

(1) Know how to recognize this type. The question stem will likely use some form of the word evaluate, determine, or useful / important to know.

(2) Know what to do with Evaluate questions. Find the conclusion and identify the main supporting premise(s), then brainstorm assumptions. Our goal is to find an answer that tests an assumption. We’re trying to test the author’s claim as scientists “ we test a hypothesis, and the answer could go either way (could make the claim more or less likely to be true, depending upon the answer to our test).

(3) The correct answer will be able to both slightly strengthen and slightly weaken the hypothesis, depending upon whether the information in that choice goes one way or the other. Incorrect answers might only strengthen the conclusion, or they might address a premise without affecting the conclusion, or they might distract us by trying to talk about some other aspect of something in the argument that doesn’t actually relate to the conclusion.
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Re: Tackling a GMATPrep CR Evaluate Problem  [#permalink]

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16 Oct 2019, 09:26
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Re: Tackling a GMATPrep CR Evaluate Problem   [#permalink] 16 Oct 2019, 09:26
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