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Mathematics>Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer.

In a recent study to determine how often people in different parts of the United States check the weather, a random sample of residents in New England and a random sample of residents on the West Coast were surveyed. The study found over 90% of people surveyed in New England checked the weather daily, while 70% of people surveyed on the West Coast did so. If the margin of error of both samples were the same, which of the following statements is best supported by the study's findings?

A.People in New England check the weather more often because the climate is colder than on the West Coast.
B.People in New England check the weather more often because there is more weather coverage on television than there is on the West Coast.
C.There is evidence that people in New England check the weather more often than people on the West Coast.
D.There is evidence that people in New England check the weather on their smartphones more than do people on the West Coast.

答案和解析

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.