每日一题：SAT数学考点试题讲解（三）

　　SAT考试总时长3小时50分钟（230分钟），共有阅读（Reading）、文法（Writing and Language）和数学（Math）三个必考科目和一个作文（Essay）选考科目。考试总分1600分中，数学占800分。数学对于接受过九年中国义务教育阶段的学生来说技能点相对简单，但对于基础阅读能力欠缺的考生可能有所挑战。对于在美国读高中的学生则是基础阅读并无大碍，但是知识点不熟练。

　　另外，SAT数学对于细心的要求很高，且换算分数时在高分区间数学是同等正确率扣分远远超过其他部分，所以满分也不是易事。想要争取1400分的学生，数学必须满分。1000-1400分分数段的学生，也要争取保650分，争700分，冲750分。

　　所以学生在备考的过程中要注意的是数学词汇。不要求拼写，但是必须可识别。例如：

　　Parallel 平行

　　Perpendicular垂直

　　Reciprocal 倒数

　　Isosceles triangle 等腰三角形

　　Equilateral triangle 等边三角形

　　Hexagon 六边形

　　试题分析

　　Mathematics>Standard Multiple Choice

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

　　A potato chip company produces the same numberof snack-sized bags of potato chips every month. Amanager at the company randomly selects a sample of snack-sized bags of potato chips to beweighed in a routine quality-assurance check each month. The January sample had ameanweight of 0.95 ounces and a margin of error of 0.06 ounces. The February sample had a meanweight of 0.98 ounces and a margin of error of 0.04 ounces. Based on these findings, which ofthe following is an appropriate conclusion?

　　A.Most of the snack-sized bags of potato chips produced by the company in January each had aweight of at least 0.95 ounces, while most of the snack-sized bags of potato chips produced bythe company in February each had a weight of at least 0.98 ounces.

　　B.The mean weight of all the snack-sized bags of potato chips produced by the company inJanuary must have been 0.03 ounces more than the mean weight of all the snack-sized bags ofpotato chips produced by the company in February.

　　C.The mean weight of all the snack-sized bags of potato chips produced by the company inJanuary was 0.03 ounces less than the mean weight of all the snack-sized bags of potato chipsproduced by the company in February.

　　D.The number of snack-sized bags of potato chips in the January sample was less than thenumber of snack-sized bags of potato chips in the February sample.

　　答案：D

　　解析：

　　Choice D is correct. Start by interpreting the resultsof each sample individually before comparing thetwo.

　　The January sample had a mean weight of 0.95 ounces and a margin of error of 0.06 ounces. The February sample had a mean weight of 0.98 ounces and a margin of error of 0.04 ounces.

　　This means that the average weight of a snack-sized bag of potato chips in the January samplewas less than the average weight of a snack-sized bag of potato chips in the February sampleand that the margin of error for the January sample was larger than the margin of error forthe February sample.

　　The weight of the samples does not mean that the entire populations had the same attributes, but the margin of error does give some insight about the sample sizes.

　　Since the population of all snack-sized bags of potato chips was the same in January as it wasin February, the larger margin of error in January indicates that the January sample size wassmaller than the February sample size.

　　以上就是小编为大家整理的关于SAT数学考点及试题讲解，希望对大家有所帮助。更多SAT考试地点、SAT考试费用等问题可以咨询我们。