2019新SAT数学练习题及答案解析8

>>SAT考试模拟题：2019新SAT数学练习题及答案解析8

>>SAT考试经典课程推荐

F(t)=0.95^(t/2)

The function F(t) gives the percentage, as adecimal, of information Dianna remembered t days after memorizing lines for a play. Assuming she did not work on her lines again, what is the best interpretation of the meaning of the function F in this context?

A.On any given day, Dianna will forget 95% of the lines 1 day after she memorizes them.

B.On any given day, Dianna will forget 95% of the lines 2 days after she memorizes them.

C.On any given day, Dianna will remember 95% of the lines 1 day after she memorizes them.

D.On any given day, Dianna will remember 95% of the lines 2 days after she memorizes them.

答案：D

解析：

Option D is correct. After 2 days, the exponent of the function will be 2/2=1. Dianna will remember (0.95^1)*100 or 95% of the lines.

In a recent study to determine how often people indifferent 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：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.

以上这些试题都是很经典的，所以极具备参考价值。复习是一步一步来的，不是一天两天就能提高的。想学习更多SAT知识点就登录坦途网SAT考试频道吧，相信通过我们的帮助，同学们的SAT考试成绩会有很大提升，小编在这里等你哦！