Information and IdeasVery hardInference from a natural experiment
Information and Ideas practice question
Two branches of the same bank sit on either side of a river. When the bridge between them closed for repairs, customers on each side could no longer easily reach the other branch. Over the closure, waiting times at the east branch doubled while those at the west branch fell by half. The most reasonable interpretation is that ____
Which choice most logically completes the text?
- A. before the closure, many east-side customers had been crossing to use the west branch.Correct
- B. the west branch closed during the repairs.
- C. the east branch hired more staff.
- D. customers stopped using banks.
Answer: A. before the closure, many east-side customers had been crossing to use the west branch.
With the bridge closed, east-side customers were forced back to their own branch, lengthening its queue and shortening the west's.
Why the other answers are wrong
- B. the west branch closed during the repairs.
- Its waiting times fell; it was open.
- C. the east branch hired more staff.
- More staff would shorten east-side waits, not double them.
- D. customers stopped using banks.
- Waiting times changed; customers still came.
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