Artists have different ways of producing contours and hatching, and analysis of these stylistic features can help to distinguish works by a famous artist both from forgeries and from works genuinely by other artists. Indeed, this analysis has shown that many of the drawings formerly attributed to Michelangelo are actually by the artist Giulio Clovio, Michelangelo’s contemporary.

Summary

Artists have different ways of producing contours and hatching. Analyzing these stylistic features can help distinguish works by a famous artist from forgeries and from works by other artists. This analysis has shown some drawings formerly attributed to Michelangelo are actually by the artist Giulio Clovio.

Notable Valid Inferences

There is a noticeable difference between the stylistic features of Giulio Clovio and Michelangelo.

A
Contours and hatching are the main features that distinguish the drawing styles of different artists.

Could be false. To say that contours and hatching are the main features is too extreme. We only know that contours and hatching are some features to help distinguish works of art. It is possible there are many more features than these.

B
Many of the drawings formerly attributed to Michelangelo are actually forgeries.

Could be false. We only know that some of these former drawings are actually Giulio Clovio’s, but we can’t assume they are forgeries. It is possible that these drawings were only mistakenly attributed to Michelangelo, and Giulio Clovio never intended to forge the drawings.

C
No forgery can perfectly duplicate the contour and hatching styles of a famous artist.

Could be false. We only know that analyzing contours and hatching helps to distinguish works between famous artists and forgeries, but we can’t assume that this analysis is foolproof.

D
The contour and hatching styles used to identify the drawings of Clovio cited can be shown to be features of all Clovio’s works.

Could be false. The stimulus does not provide us any information about Clovio’s works to infer this statement. It is possible that Clovio’s style changed over time, so Clovio may not use the same features in all of his works.

E
There is an analyzable difference between Clovio’s contour and hatching styles and those of Michelangelo.

Must be true. We can infer that an analyzable difference exists because the analysis described in the stimulus did in fact help to show that some drawings formerly attributed to Michelangelo are actually by Clovio.


6 comments

Jones fell unconscious on the job and it was suspected that he had swallowed a certain chemical, so he was rushed to the local hospital’s emergency room. In making her diagnosis, the emergency-room physician knew that if Jones had swallowed the chemical, a deficiency in the content of a mineral in his blood would result. She also knew that deficiency in the mineral causes inflammation of the skin. Since Jones’s skin was not inflamed when he was admitted to the emergency room, the physician concluded that Jones had not swallowed the chemical.

Summarize Argument
The physician concludes that Jones did not swallow the chemical in question. As support, the physician references the following relationship:
Jones swallowed the chemical→mineral deficiency in blood→ skin inflammation
Jones’s skin was not inflamed, so the physician said that he did not swallow the chemical.

Notable Assumptions
The physician assumes that there wouldn’t be any delay in the reactions. If there is any delay in the effects of either the chemical or the mineral deficiency, it could be the case that an insufficient amount of time had passed for Jones’s skin to become inflamed. If this is the case, Jones’s clear skin would be because not enough time had passed, not because he didn’t swallow the chemical.

A
Jones did not know that the chemical was dangerous.
The argument is based on the effects of consuming the chemical; these effects would occur regardless of whether Jones knew about the dangers.
B
Jones had suffered inflammation of the skin in the past.
We care about skin inflammation because it could be an indicator of whether or not Jones consumed the chemical; for the sake of the argument, we don’t care about skin inflammation that occurred independent of Jones’s potential consumption of the chemical.
C
It takes 48 hours for the chemical to bring about deficiency of the mineral in the blood.
This weakens the argument because it gives an alternate explanation for Jones’s clear skin. Jones’s skin could be clear because 48 hours hadn’t yet passed, not because he didn’t consume the chemical. Not enough time would have passed for the physician to make her conclusion.
D
Jones often worked with the chemical.
The argument is about whether or not Jones consumed the chemical in this specific instance; Jones’s history of working with the chemical is not relevant to the physician’s argument.
E
Deficiency in minerals other than the mineral in question can cause inflammation of the skin.
The physician’s argument is based on the fact that Jones’s skin is NOT inflamed, so other potential causes of skin inflammation are not relevant here.

5 comments

Beginning in the 1950s, popular music was revolutionized by the electrification of musical instruments, which has enabled musicians to play with increased volume. Because individual musicians can play with increased volume, the average number of musicians per band has decreased. Nevertheless, electrification has increased rather than decreased the overall number of musicians who play popular music professionally.

Summary
The electrification of musical instruments has enabled musicians to play at increased volume. Because individual musicians can play with increased volume, the average number of musicians per band has decreased. However, the number of musicians who play popular music professionally has increased because of electrification.

Strongly Supported Conclusions
Because of electrification of musical instruments, the total number of professional bands has increased.

A
The number of amateur musicians who play popular music has decreased.
This answer is unsupported. We don’t know anything about amateur musicians from the stimulus. The stimulus is limited to professional musicians.
B
Most professional musicians are able to play both electric and nonelectric instruments.
This answer is unsupported. We don’t know anything about nonelectric instruments from the stimulus. The stimulus is limited to electrified instruments.
C
The number of professional musicians in some bands has increased.
This answer is unsupported. The stimulus tells us that the average number of musicians per band has decreased.
D
The total number of professional bands has increased as a result of electrification.
This answer is strongly supported. If the average number of musicians per band decreased at the same time the total number of musicians increased, then it must be that the total number of bands has also increased.
E
Many professional musicians play in more than one band.
This answer is unsupported. We don’t know from the stimulus anything about the ability to play in more than one band.

27 comments