SAT数学每日一练daily practice(2018年3月23日）

2018年3月23日的SAT数学每日一练如下：

Mathematics>Standard Multiple Choice

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

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

A.People in New England check the weather more often because the climate is colder than onthe West Coast.

B.People in New England check the weather more often because there is more weathercoverage 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 onthe West Coast.

D.There is evidence that people in New England check the weather on their smartphonesmore than do people on the West Coast.

答案：C
解析：

Choice C is correct. A sample survey is a study thatobtains data from a subset of a population, usuallythrough a questionnaire or interview, in order toestimate population attributes.

Since the margin of error is the same for each sample, the only reasonable conclusionbased on the data from the observational study is that there is evidence (although not aguarantee) that people in New England check the weather more often than people do on theWest Coast.

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