Exams › IBPS PO › Quantitative Aptitude

Argument: 80% flyers are satisfied. Evidence: 20% said 'yes' to 'Do you have complaints?' (survey outside airport terminal). Which option most UNDERMINES this conclusion?

1. Sixty percent of the people coming out of the airline terminal were not people who had just gotten off a flight.
2. One percent of the people approached by the interviewers refused to respond to their inquiries.
3. The interviewers began their inquiry just after passengers were discharged from a flight that was 40 minutes late.
4. The interviewers were able to speak to only 70 percent of the people leaving the terminal, but those people were selected at random.

Correct answer: Sixty percent of the people coming out of the airline terminal were not people who had just gotten off a flight.

Solution

The argument's flaw: survey assumes all terminal-exiting people just flew. Option A: 60% of surveyed people were NOT actual flyers → the 20% complaint rate comes from a mixed sample, not valid representation of flyer satisfaction → undermines the 80% satisfaction claim. Options C/D weaken slightly but not as fundamentally.

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