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21 Jan 2026, 22:00
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E
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Difficulty:
25%
(medium)
Question Stats:
86% (01:54) correct
14%
(02:00)
wrong
based on 104
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The participants sorted into the experimental group of a consumer focus test were instructed to use a new brand of degreasing agent to clean their car engines for a month. Afterward, the members of this group reported a drop in their cars’ acceleration speed, while the control group, those who did not use the degreasing agent, did not report any drop. The detrimental effects on the cars were attributed to a petroleum solvent that is the principal active ingredient in the degreasing agent.
Which of the following, if true, would best help explain how the degreasing agent might produce the observed effect?
A. Chemical analysis of the degreasing agent determined that a concentrated form of the agent was used.
B. Subjects in the focus group did not know whether they were cleaning their car engines with the new degreasing agent or some other substance that is harmless.
C. As the primary use of the degreasing agent is as a cleaning agent, its negative effects are rarely noticed by car owners.
D. The petroleum solvent that is a constituent of the degreasing agent is also sold separately as a heavy-duty industrial cleaner.
E. A high level of the petroleum solvent degrades engine components responsible for the acceleration process.
Which of the following, if true, would best help explain how the degreasing agent might produce the observed effect?
A. Chemical analysis of the degreasing agent determined that a concentrated form of the agent was used.
B. Subjects in the focus group did not know whether they were cleaning their car engines with the new degreasing agent or some other substance that is harmless.
C. As the primary use of the degreasing agent is as a cleaning agent, its negative effects are rarely noticed by car owners.
D. The petroleum solvent that is a constituent of the degreasing agent is also sold separately as a heavy-duty industrial cleaner.
E. A high level of the petroleum solvent degrades engine components responsible for the acceleration process.
22 Jan 2026, 00:29
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some people were put into the group to use the new degreasing agent to clean their car engines.
the people in this group saw decrease in acceleration speed while people who didnt use the agent didnt see any drop in speed.
conclusion- petroleum solvent present in degreaser was the reason for bad effect on the cars.
A thats good but doesnt tell whether it was the solvent that caused the decrease in speed or not.
B thats not at all the main concern here.
C thats car owners problem for not looking at negative effect. we are concerned with role of degreaser in reducing the speed.
D good for industrial people. but we are not worried about its other usage.
E this clearly tell the hidden reasoning behind the outcome.
the people in this group saw decrease in acceleration speed while people who didnt use the agent didnt see any drop in speed.
conclusion- petroleum solvent present in degreaser was the reason for bad effect on the cars.
A thats good but doesnt tell whether it was the solvent that caused the decrease in speed or not.
B thats not at all the main concern here.
C thats car owners problem for not looking at negative effect. we are concerned with role of degreaser in reducing the speed.
D good for industrial people. but we are not worried about its other usage.
E this clearly tell the hidden reasoning behind the outcome.
ExpertsGlobal5
22 Jan 2026, 12:11
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A high level of the petroleum solvent degrades engine components responsible for the acceleration process. - Hence E
