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答案：C
解析：
Choice C is correct. A sample survey is a study that obtains data from a subset of a population, usually through a questionnaire or interview, in order to estimate population attributes.
Since the margin of error is the same for each sample, the only reasonable conclusion based on the data from the observational study is that there is evidence (although not a guarantee) that people in New England check the weather more often than people do on the West Coast.
