A survey was recently conducted among ferry passengers on the North Sea. Among the results was this: more of those who had taken anti-seasickness medication before their trip reported symptoms of seasickness than those who had not taken such medication. It is clear, then that despite claims by drug companies that clinical tests show the contrary, people would be better off not taking anti-seasickness medications.
Which one of the following, if true, would most weaken the conclusion above?
Conclusion - despite claims by drug companies that clinical tests show the contrary, people would be better off not taking anti-seasickness medications.
Pre-thinking -- what if the group of people who took the medication would have been worse without it
(A) Given rough enough weather, most ferry passengers will have some symptoms of seasickness. -- Irrelevant
(B) The clinical tests reported by the drug companies were conducted by the drug companies’ staffs. -- Irrelevant
(C) People who do not take anti-seasickness medication are just as likely to respond to a survey on seasickness as people who do. -- Incorrect -- so the survey is proper
(D) The seasickness symptoms of the people who took anti-seasickness medication would have been more severe had they not taken the medication.- Correct
(E) People who have spent money on anti-seasickness medication are less likely to admit symptoms of seasickness than those who have not. -- Irrelevant -- it tells that number of people who have taken anti-seasickness medication and have symptoms are more that survey suggests
Answer D
If we change option C to People who do not take anti-seasickness medication are
less likely to respond to a survey on seasickness as people who do -- Will this too be a valid weakener ?
AjiteshArun ,
mikemcgarry ,
VeritasPrepKarishma ,
sayantanc2k ,
GMATNinja ,
ChiranjeevSingh , other experts -- please enlighten .