선택지 네 함정
실전문제 5

A small trial tested a water-saving message in two apartment buildings. Residents in Building A received monthly comparisons of their water use with that of similar households. Building B received ordinary bills. During the three-month trial, average use fell in A and remained nearly unchanged in B. The researcher suggested that the comparison message may have encouraged conservation among the households studied. She did not claim that residents had become more concerned about the environment: the trial measured consumption, not motives. Nor did it establish that the effect would continue after messages stopped. The buildings differed in several respects, so the researcher called for a larger, randomly assigned study before recommending the message to every housing provider.

A small trial tested a water-saving message in two apartment buildings. Residents in Building A received monthly comparisons of their water use with that of similar households. Building B received ordinary bills. During the three-month trial, average use fell in A and remained nearly unchanged in B. The researcher suggested that the comparison message may have encouraged conservation among the households studied. She did not claim that residents had become more concerned about the environment: the trial measured consumption, not motives. Nor did it establish that the effect would continue after messages stopped. The buildings differed in several respects, so the researcher called for a larger, randomly assigned study before recommending the message to every housing provider.

A small trial tested a water-saving message in two apartment buildings. Residents in Building A received monthly comparisons of their water use with that of similar households. Building B received ordinary bills. During the three-month trial, average use fell in A and remained nearly unchanged in B. The researcher suggested that the comparison message may have encouraged conservation among the households studied. She did not claim that residents had become more concerned about the environment: the trial measured consumption, not motives. Nor did it establish that the effect would continue after messages stopped. The buildings differed in several respects, so the researcher called for a larger, randomly assigned study before recommending the message to every housing provider.

A small trial tested a water-saving message in two apartment buildings. Residents in Building A received monthly comparisons of their water use with that of similar households. Building B received ordinary bills. During the three-month trial, average use fell in A and remained nearly unchanged in B. The researcher suggested that the comparison message may have encouraged conservation among the households studied. She did not claim that residents had become more concerned about the environment: the trial measured consumption, not motives. Nor did it establish that the effect would continue after messages stopped. The buildings differed in several respects, so the researcher called for a larger, randomly assigned study __________.

A small trial tested a water-saving message in two apartment buildings. Residents in Building A received monthly comparisons of their water use with that of similar households. Building B received ordinary bills. During the three-month trial, average use fell in A and remained nearly unchanged in B. The researcher suggested that the comparison message may have encouraged conservation among the households studied. She did not claim that residents had become more concerned about the environment: the trial measured consumption, not motives. Nor did it establish that the effect would continue after messages stopped. The buildings differed in several respects, so the researcher called for a larger, randomly assigned study before recommending the message to every housing provider.