GRE数学误区1、余数一定是大于等于0的.
比如,-17除以7,商-3余4,而不是像我们很多人那样想的商2余-3
GRE数学误区2、大学学理工科的同学不要被大学实验课其他相关课程的四舍五入概念混淆头脑就用最简单的,如果尾数是5,四舍五入就进位.
而大学里学的是,尾数是5,如果前面为奇,进位成偶数;如果前面为偶,不变,舍去.简单来讲就是四舍五入后让尾数是偶数的原则.
GRE数学误区3、关于四分位差interquartile range,百度百科所说的用法和GRE中的用法不同.根据OG,四分位数有很多算法,但是GRE采取的哪一种,大家务必明确记住啊.
【四分位数是将一组数据由小到大排序后,用3个点将全部数据分为4等份,与这3个点位置上相对应的数值称为四分位数,分别记为Q1、Q2、Q3.其中,Q3到Q1之间的距离又称为四分位差,记为Q.四分位差越小,说明中间部分的数据越集中;四分位数越大,则意味着中间部分的数据越分散.】
具体四分位数的题目,在Math Review有详解~感谢童鞋们的样题解析,看这里OG中一道data analysis数学题
P296中一道关于计算 interquartile range的题目,原题如下:2. The numbers of passengers on 9 airline ?ights were 22, 33, 21, 28, 22, 31, 44,) 50, and 19. The standard deviation of these 9 numbers is approximately.
equal to 10.2
If each ?ight had had 3 times as many passengers, what would have been
the mean, median, mode, range, interquartile range, and standard
deviation of the nine numbers?
这个 interquartile range我觉得怎么应该是Q3-Q1=33-22=11呢?这一系列数字19、21、22、22、28、31、33、44、50难道Q3和Q1不是分别为33、22吗?
GRE数学误区4、关于正态分布,请注意区分标准正态分布和一般正态分布.
标砖正态分布:The standard normal distribution has mean 0 and standard deviation 1. The following figure shows the distribution, including approximate probabilities corresponding to the six intervals shown.,那张正态分布图上的0.02、0.14、0.34这些数据都要记下来~据说前面几场考试有涉及.
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