PT138.S3.Q7

SECTION 1 · 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

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 Question 26

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 · lr

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PrepTest 138 - Section 3 - Question 7

Question

Explanation

Analytics

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Researcher: Support Accurate readings of air pollution are expensive to obtain. ███████ ███ ███████ █████████ █████████ ████ ██████ ████████ ██████████ ███ ██ ███ █████ █ ███████ ███ ██ ███████ ███ ████████ ██ ███████████ █████ █ █████████ ███████ ██ █████ ███████ ██ ████████ ██████ ██████████ ██████████ ███ ████████ ██████ ██████████████ ███ ████████ ███ ███████ ████ █████ ████████ █████ ██████████ ██████████ ████████ ███ ███████ ████ ██ ████████ ██ ███ ████ █████████ ██████████ █████ ███████ ███ ███████████ ███████ █████████ ████████████████████ ███████ ███████ ████ ██ ████████████

Summarize Argument

The researcher concludes that lichens can replace expensive pollution monitors without losing accuracy. As evidence, he describes an experiment in which he collected lichens from areas with copper pollution, measured their copper concentration, and compared the results with mechanical monitors. He found that the lichens were as accurate as the best equipment.

Notable Assumptions

The researcher assumes that the lichens he tested are representative of all lichens. He also assumes that lichens can be used to accurately measure overall air pollution simply because they can be used to accurately measure copper pollution. He assumes that lichens absorb other pollutants, not just copper.

Analysis by EleanorRoberts

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

Mechanical monitoring devices ████ ███ ███████ ████ █████████ ██ █████ █████ ███ █████████ ██ █ ███████ ████████

Irrelevant. It doesn't matter where mechanical monitors have already been installed. This fails to address whether lichens can be used to accurately measure all air pollution or just copper pollution.

Copper particles are █ █████████ ██ ███ █████████ ██ ███████ ████████

Even if lichens can accurately measure one component of air pollution, we still need to know whether they can accurately measure the other components of air pollution.

Experiments have shown ████ ███████ ██████ ██ █████ █████ ███ █████████ ██ ████████

This fails to address whether lichens can accurately measure overall air pollution.

Lichens can easily ██ █████ ██ █████████████

Lichens may be easy to grow, but we still don’t know whether they can accurately measure overall air pollution.

Lichens absorb all █████ ███████████ ███ ██████████ ██ █ ██████ ███████ ██ █████ ██████████ ██ ███████

This suggests that lichens may indeed be an effective replacement for expensive pollution monitors. If lichens absorb all other major air pollutants like they do copper, then one can track the concentration of all the pollutants to measure overall air pollution.

Difficulty

Question

93% of people who answer get this correct

This is a slightly challenging question.

CURVE

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

25% 126

137

75% 147

Analysis

Question Stem Tags

Strengthen

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

Stimulus Tags

Link assumption

Arguments that feature an unjustified shift from one concept to another, which don't fit neatly into other common flaw categories (e.g. moving from premises about "houses" to a conclusion about "dwellings").

Answer Popularity

Popularity Avg. score

154

159

156

157

93%

165

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