PT157.S3.Q25

SECTION 1 · rc

PASSAGE 1
Question 1 Question 2 Question 3 Question 4 Question 5

PASSAGE 2
Question 6 Question 7 Question 8 Question 9 Question 10 Question 11 Question 12

PASSAGE 3
Question 13 Question 14 Question 15 Question 16 Question 17 Question 18 Question 19

PASSAGE 4
Question 20 Question 21 Question 22 Question 23 Question 24 Question 25 Question 26 Question 27

SECTION 2 · 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 3 · 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 4 · rc

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

PASSAGE 2
Question 8 Question 9 Question 10 Question 11 Question 12 Question 13 Question 14

PASSAGE 3
Question 15 Question 16 Question 17 Question 18 Question 19 Question 20 Question 21 Question 22

PASSAGE 4
Question 23 Question 24 Question 25 Question 26 Question 27

PrepTest 157 - Section 3 - Question 25

Question

Explanation

Analytics

Show analysis

Support To test the claim that vitamin C is effective in treating acne, scientists administered it to one group of subjects and a placebo to a control group. ███ █████ █████████ ███████ █ ███ ████ ██████ ████ ██████ ███ █████ ████ ███ ███ ███████ ██████ ██ ███ ████████████ ███████████ ████████ ████ ████ ██ ███ ████████ ██ ████ █████ ████ █████ ████ ██ ████ ████ ████ ██████ █████ █████ ███ █████ ███ █████ ██ ██████████ ██ ███ ████████ ██ ████ ███ █████ ███████ ███ ███ ███████ ██████████ ██ ███ ███████████ ████████ ████ ███████ █ ███ ██ ████ ███████ ██ ████████ ███ ████████ ██ █████

Summarize Argument: Phenomenon-Hypothesis

The author hypothesizes that vitamin C does not help reduce the severity of acne. This is based on a study showing no difference in the severity of acne between a group given vitamin C and a control group given a placebo.

Notable Assumptions

The argument assumes that there were no differences between the vitamin C group and the control group that could have made the vitamin C group’s acne more severe, thus masking the beneficial effect of vitamin C. The argument also assumes that before the study began, the vitamin C group did not start with more severe acne than the control group, which is another way beneficial effects of vitamin C could have been masked.

Analysis by Kevin_Lin

Show answer

25.

Which one of the following, ██ █████ ████ █████████ ███████ ███ █████████

The subjects who ████ █████ ███████ █ ███ █ ███████ ██ █████████ ████ ████ ██████ ████ ████ ███ ███ ████████ █████████ █ ████████

This explains how the two groups might end up with the same severity of acne even if vitamin C does help to reduce severity. Vitamin C may have reduced the severity down to the same level as that of the placebo group.

None of the ████████ ███ ████ █████ ███████ █ ████ ██████████ █████ ██ ███████ █ ██ █████ ████

If this has any impact at all, this might strengthen the argument by showing that the vitamin C group didn’t take more vitamin C than they were supposed to. Learning that study subjects didn’t do things they weren’t supposed to doesn’t undermine an argument based on a study.

During the study, ███ ████████ ██ ███ █████████ ████ ███ █████ ████ ███ ████████ ████████

How the subjects’ acne compared to the national average is irrelevant because we’re comparing the severity of the vitamin C group’s acne to the severity of the placebo group’s.

Some of the ████████ ███ ████ █████ ████████ ████████ █████ ██████ ███ █████ ████ ███ █████████ ████ ██ ███████ ██

We have no reason to think this isn’t equally true of the vitamin C group. In addition, “some” subjects could just be a single person, which would not necessarily affect the overall average results observed in the placebo group.

Some of the ████████ ███ ████ █████ █████ ████ ████████ ███ ███ ████████ ████ ███ █████ ████ ████ ██████

The conclusion isn’t based on data about the people that knew they got the placebo or the vitamin C. It’s based on data about the people that didn’t know whether they got the placebo or the vitamin C.

Difficulty

Question

43% of people who answer get this correct

This is a very difficult question.

CURVE

Score of students with a 50% chance of getting this right

25% 151

166

75% 180

Analysis

Question Stem Tags

Weaken

Stems that ask us to provide an additional piece of information that, if true, would weaken the argument in the stimulus.

Answer Popularity

Popularity Avg. score

41%

164

155

154

38%

160

11%

156

Question history

You don't have any history with this question.. yet!