Employee: My boss says that my presentation to our accounting team should have included more detail about profit projections. But people’s attention tends to wander when they are presented with too much detail. So, clearly my boss is incorrect.

Summarize Argument: Counter-Position
The author concludes that the presentation to the accounting team was appropriate in leaving out “more detail” about profit projections. This is based on the fact that people’s attention tends to wander when they’re presented with “too much” detail.

Identify and Describe Flaw
The author overlooks the possibility that the presentation should have included more detail, but not so much that it would be “too much.

A
takes for granted that the boss’s assessments of employee presentations are generally not accurate
The author doesn’t assume that the boss’s assessments are “generally” not accurate. The author takes issue with the boss’s specific claim about a particular presentation.
B
fails to distinguish between more of something and too much of it
The author fails to distinguish between more detail and too much detail. The presentation could have included more detail, even if too much detail is also undesirable.
C
fails to consider that an audience’s attention might wander for reasons other than being presented with too much detail
The author doesn’t assume that the only reason people’s attention might wander is too much detail. The author merely cites too much detail as one reason people’s attention might wander.
D
infers a generalization based only on a single case
The conclusion is not a generalization. It’s a claim about a specific presentation.
E
confuses two distinct meanings of the key term “detail”
The word “detail” does not take on two different meanings in this argument.

1 comment

The local news media have long heralded Clemens as an honest politician. They were proven wrong when Clemens was caught up in a corruption scandal. This demonstrates how the local media show too much deference toward public figures. Even the editor of the local newspaper admitted that her reporters neglected to follow leads that might have exposed the scandal far earlier.

Summarize Argument
The local news media show too much deference toward public figures, as demonstrated by the Clemens corruption scandal. Prior to the scandal, the local news media characterized Clemens as an honest politician. Additionally, reporters at the local newspaper failed to follow leads that may have exposed the scandal earlier.

Identify Conclusion
The local news media show too much deference toward public figures: “the local media show too much deference toward public figures.”

A
Clemens has long been portrayed as an honest politician by the local news media.
This is a premise. The media’s long-time characterization of Clemens as an honest politician demonstrates how the local news media show too much deference toward public figures.
B
The local news media were wrong to herald Clemens as an honest politician.
This is a premise. The local media’s incorrect characterization of Clemens as an honest politician demonstrates how the local news media show too much deference toward public figures.
C
The local news media show too much deference toward public figures.
This rephrases the conclusion.
D
Reporters from the local newspaper neglected to follow leads that might have exposed the scandal much earlier.
This is a premise. It supports the conclusion that the local media show too much deference toward public figures.
E
The local newspaper’s treatment of Clemens is indicative of its treatment of public figures in general.
The local newspaper’s treatment of Clemens is an example of how the local news media treats public figures. The other premises, however, discuss the local news media generally. The overall conclusion of the argument is about local news media, not the newspaper specifically.

13 comments

If newly hatched tobacco hornworms in nature first feed on plants from the nightshade family, they will not eat leaves from any other plants thereafter. However, tobacco hornworms will feed on other sorts of plants if they feed on plants other than nightshades just after hatching. To explain this behavior, scientists hypothesize that when a hornworm’s first meal is from a nightshade, its taste receptors become habituated to the chemical indioside D, which is found only in nightshades, and after this habituation nothing without indioside D tastes good.

Summarize Argument: Phenomenon-Hypothesis
Scientists hypothesize that when a hornworm’s first meal is from a nightshade, its taste receptors become habituated to indioside D, and afterward anything without indioside D doesn’t taste good. This is based on the fact that newly hatched hornworms that first feed on nightshades don’t eat leaves from non-nightshades afterward, whereas newly hatched hornworms that first feed on non-nightshades are open to eating non-nightshades afterward.

Notable Assumptions
The author assumes that there isn’t another explanation for the observed diet patterns of hornworms. For example, what if there’s some other chemical besides indioside D that might be the reason hornworms that eat nightshades prefer nightshades and don’t eat non-nightshades? Or what if the hornworms don’t necessarily care about the taste of nightshades, but become physically addicted to it, without regard to taste?

A
Tobacco hornworms that first fed on nightshade leaves show no preference for any one variety of nightshade plant over any other.
We’re concerned with the consumption of nightshades vs. non-nightshades. Preferences or the lack of preferences within the nightshades has no clear impact.
B
If taste receptors are removed from tobacco hornworms that first fed on nightshade leaves, those hornworms will subsequently feed on other leaves.
This corroborates the theory that taste receptors are part of the explanation for the observed diet patterns.
C
Tobacco hornworm eggs are most commonly laid on nightshade plants.
Where the eggs are laid has no clear impact. We’re concerned with the diet patterns of newly hatched nightshades and what explains the distaste for non-nightshades among the worms that first feed on nightshades.
D
Indioside D is not the only chemical that occurs only in nightshade plants.
This weakens the argument by suggesting there may be another chemical responsible for the worms’ preference for nightshades after first feeding on nightshades.
E
The taste receptors of the tobacco hornworm have physiological reactions to several naturally occurring chemicals.
This doesn’t help connect taste receptors to habituation to nightshades or to the chemical indioside D. We also don’t know the significance of a “physiological reaction.” Does that mean the worms can taste chemicals? We don’t know.

7 comments

Home ownership is a sign of economic prosperity. This makes it somewhat surprising that across the various regions of Europe and North America, high levels of home ownership correspond with high levels of unemployment.

"Surprising" Phenomenon

Why is it that, even though home ownership is a sign of economic prosperity, high levels of home ownership correspond with high levels of unemployment across Europe and North America?

Objective

The correct answer will connect home ownership and unemployment in a way that explains why home ownership can lead to or cause unemployment, either by causing a homeowner to lose his job or by making that homeowner less able to acquire a new job.

A
Home ownership makes it more difficult to move to a place where jobs are more plentiful.

This explains the connection between home ownership and unemployment. If someone buys a home in a place with few available jobs, it is more difficult for him to move to a place with more available jobs and thus, it is more difficult for him to acquire a job.

B
Over the last few decades jobs have been moving from centralized areas to locations that are closer to homeowners.

This deepens the conflict by saying that jobs are more available to or convenient for homeowners. It does not provide an explanation for why home ownership and unemployment are connected.

C
The correspondence between high levels of home ownership and high levels of unemployment holds across countries with widely different social systems.

It may be the case that home ownership and unemployment are connected even across countries in Europe and North America with different social systems. But this does not provide an explanation for why home ownership and unemployment are connected in the first place.

D
People who own homes are more likely than those who rent to form support networks that help them to learn of local jobs.

Like (B), this deepens the conflict by saying that jobs are more available to or convenient for homeowners. It does not provide an explanation for why home ownership and unemployment are connected.

E
People are more likely to buy homes when they are feeling economically secure.

This provides a connection between home ownership and economic security, rather than between home ownership and unemployment. We cannot assume that unemployment gives one a feeling of economic security, so (E) does nothing to resolve the apparent conflict.


27 comments

The size of the spleen is a good indicator of how healthy a bird is: sickly birds generally have significantly smaller spleens than healthy birds. Researchers found that, in general, birds that had been killed by predators had substantially smaller spleens than birds killed accidentally.

Summary

The size of a bird’s spleen is a good indicator of the bird’s health. Sick birds usually have much smaller spleens than healthy birds. Researchers found that birds killed by predators generally had much smaller spleens than those killed accidentally.

Strongly Supported Conclusions

Healthier birds are less likely to be killed by predators and sickly birds are more likely to be killed by predators.

Predators may target weaker birds over healthier birds.

Accidental deaths in birds may be less related to healthiness than death by predation.

A
Predators are unable to kill healthy birds.

Unsupported. We know that birds killed by predators generally have smaller spleens, but we cannot conclude that predators are unable to kill healthy birds.

B
Most birds with smaller than average spleens are killed by predators.

Unsupported. Birds killed by predators generally have smaller spleens, but we cannot conclude that most birds with small spleens are killed by predators. Perhaps most birds die from some other cause but, of the few birds killed by predators, many have small spleens.

C
Predators can sense whether a bird is sick.

Unsupported. Predators tend to kill birds with smaller spleens, but this does not mean that predators can sense whether a bird is sick. Perhaps sick birds are simply slower than healthy ones and cannot escape predators. The stimulus doesn’t give us enough information on this.

D
Sickly birds are more likely than healthy birds to be killed by predators.

Strongly supported. Sickly birds usually have smaller spleens than healthy birds. And birds with smaller spleens are more likely to be killed by predators. So, sickly birds are more likely than healthy birds to be killed by predators.

E
Small spleen size is one of the main causes of sickness in birds.

Unsupported. Sick birds tend to have small spleens, but we cannot conclude that small spleens cause sickness in birds.


3 comments