Question 7

The argument is most vulnerable to criticism on grounds that it groups together those people who experienced a complete elimination of back pain with those who experienced only a significant reduction.

The argument fails to differentiate between individuals who have completely eliminated their back pain and those who have only seen a significant reduction. This lack of distinction can lead to misleading conclusions about the efficacy of the Backease cushion.

A) overlooks the possibility that people who develop back pain and do not use a Backease cushion can readily find an effective alternative

This option is incorrect because it addresses the potential for alternatives to the Backease cushion rather than the argument's fundamental flaw. The focus of the criticism is specifically on how results are grouped rather than on the existence of other solutions.

B) overlooks the possibility that some of the people surveyed use a Backease cushion for reasons other than the alleviation of back pain, such as helping them to relax

This statement is also incorrect as it pertains to alternative uses of the cushion, which does not directly challenge the argument's grouping of results. The primary issue remains the classification of pain relief outcomes rather than the motivation for using the cushion.

C) overlooks the possibility that among the 30 percent who did not experience a significant reduction or complete elimination of their back pain, some experienced a moderate improvement

While this option raises a valid point about the range of experiences, it does not pinpoint the critical flaw regarding the lack of distinction in the grouping of results. Therefore, it does not adequately address the argument's vulnerability.

D) relies solely on personal reports rather than on reasoning

This option is incorrect because the vulnerability lies in the categorization of data rather than solely the reliance on personal reports. The argument can still hold some weight if the reasoning is sound, even if based on personal reports.

Conclusion

In summary, option E accurately identifies that the argument's weakness stems from its failure to distinguish between those who experienced complete elimination of back pain and those who only saw significant reduction. This grouping can obscure the true effectiveness of the Backease cushion, making it a critical flaw that undermines the argument. All other options either address unrelated concerns or fail to highlight the essential issue at hand.