PT142.S4.Q18 > Question

SECTION 1 · lr

Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7 Question 8 Question 9 Question 10 Question 11 Question 12 Question 13 Question 14 Question 15 Question 16 Question 17 Question 18 Question 19 Question 20 Question 21 Question 22 Question 23 Question 24 Question 25

SECTION 2 · lr

SECTION 3 · rc

PASSAGE 1

Question 1 Question 2 Question 3 Question 4 Question 5 Question 6 Question 7 Question 8

PASSAGE 2

Question 9 Question 10 Question 11 Question 12 Question 13 Question 14 Question 15 Question 16

PASSAGE 3

Question 17 Question 18 Question 19 Question 20 Question 21

PASSAGE 4

Question 22 Question 23 Question 24 Question 25 Question 26 Question 27

SECTION 4 · lr

The author concludes that the pineal gland produces less melatonin as it ages. This is based on a study of people aged 65-81 suffering from insomnia. The study showed that most insomnia symptoms in these people are reduced by eating melatonin. Melatonin is a hormone produced by the pineal gland, and it has a role in regulating the body’s biological block.

The author assumes that the melatonin of people in the study is lower than those levels would have been when those people were younger. The author also assumes that people in the study, who all have insomnia, are representative of people generally with respect to melatonin at the corresponding age (65-81). This overlooks the possibility that the study’s subjects have unusually low melatonin (which might be why they have insomnia). An average person might not have low insomnia at 65-81.

The author does not make any assumptions about intentions. Whether people take melatonin because they intended to reduce insomnia symptoms doesn’t matter. We know that eating melatonin did reduce symptoms in the study.

The argument doesn’t rely on opinions to support the conclusion. The conclusion happens to refer to the claims of manufacturers, but this reference is not used as part of the reason to believe that the pineal gland produces less melatonin as it ages.

There is no term that is used in two different ways. “Insomnia,” “melatonin,” “pineal gland” all have consistent meanings.

It’s not clear what (D) refers to. In any case, we don’t know know from the premises that any causal relationship is reversed. Does lower melatonin cause insomnia, or is it reversed? We don’t know, so can’t say that the author is confusing an effect for a cause.

The study only included people with insomnia, and only included people 65-81. We don’t know whether people with insomnia have unusually low melatonin for their age. And we don’t know whether the melatonin levels change by age, since the study didn’t evaluate younger people.

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