GRE数学统计学知识难点总结,本文就GRE数学统计学知识难点做总结,希望可以给大家提供一些参考,预祝大家取得理想的GRE考试成绩。
1.mode
一堆数中出现频率最高的一个或几个数
e.g. mode of 1,1,1,2,3,0,0,0,5 is 1 and 0
2.range
一堆数中最大和最小数之差 ,所以统计学上又称之为极差
e.g. range of 1,1,2,3,5 is 5-1=4
3.mean
arithmatic mean: n个数之和再除以n
geometric mean : n个数之积的n次方根
4.median
将一堆数排序之后,正中间的一个数,
或者中间两个数的平均数
e.g. median of 1,7,4,9,2,2,2,2,2,5,8 is 2
median of 1,7,4,9,2,5 is /2=6
5.standard error
一堆数中,每个数与平均数的差的绝对值之和,除以这堆数的个数
e.g. standard error of 0,2,5,7,6 is:
/5=2.4
6.standard variation
一堆数中,每个数与平均数之差的平方之和,再除以n
标准方差的公式:d2=/n
e.g. standard variation of 0,2,5,7,6 is: average=4
2 +2+2+2+2)/5=6.8
7.standard deviation 标准偏差
就是standard variation的平方根 d
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