과천외고 영어 내신 복습: 그럴듯한 오답 선지 하나를 직접 만드는 법 실전문제

A cafe offered an early-morning discount for a week. Purchases by commuters increased, while afternoon sales remained stable. The owner did not survey customers who avoided the cafe entirely.

Students tested paper planes in two halls. Planes in Hall A traveled farther, but Hall A also had stronger airflow and a smoother launching surface. The students had not held those conditions constant.

Supporters of a new footbridge said it would increase visits to local shops. Opponents argued that it would divert visitors away from the old street. A report found that neither prediction rested on complete travel data. It recommended further study before choosing a design.

An initial survey found that people who attended evening workshops were more likely to use the community library. It did not establish whether the workshops caused library use; frequent readers might simply have been more likely to attend. A later program randomly assigned invitations to similar residents. Those invited visited more often during the program, but the study did not measure how deeply they read or whether the change lasted after the program ended. The later evidence strengthened a causal interpretation for visits under the tested conditions, without settling every broader claim about reading.