外语教育网
您的位置:外语教育网 > 英语文化视窗 > 文学与艺术 > 散文 正文
  • 站内搜索:

Statistics

2006-05-28 23:43

  There were two widely divergent influences on the early development of statistical methods. Statistics had a mother who was dedicated to keeping orderly records of government units (states and statistics come from the same Latin root status) and a gentlemanly gambling father who relied on mathematics to increase his skill at playing the odds in games of chance. The influence of the mother on the offspring, statistics, is represented by counting, measuring, describing, tabulating, ordering, and the taking of censuses-all of which led to modern descriptive statistics. From the influence of the father came modern inferential statistics, which is based squarely on theories of probability.

  Describing collections involves tabulating, depicting and describing collections of data. These data may be quantitative such as measures of height, intelligence or grade level——variables that are characterized by an underlying continuum——or the data may represent qualitative variables, such as sex, college major or personality type. Large masses of data must generally undergo a process of summarization or reduction before they are comprehensible. Descriptive statistics is a tool for describing or summarizing or reducing to comprehensible form the properties of an otherwise unwieldy mass of data.

  Inferential statistics is a formalized body of methods for solving another class of problems that present great of problems characteristically involves attempts to make predictions using a sample of observations. For example, a school superintendent wishes to determine the proportion of children in a large school system who come to school without breakfast, have been vaccinated for flu, or whatever. Having a little knowledge of statistics, the superintendent would know that it is unnecessary and inefficient to question each child: the proportion for the sample of as few as 100 children. Thus , the purpose of inferential statistics is to predict or estimate characteristics of a population from a knowledge of the characteristics of only a sample of the population.

相关热词:文化 散文
栏目相关课程表
科目名称 主讲老师 课时 免费试听 优惠价 购买课程
英语零起点 郭俊霞 30课时 试听 150元/门 购买
综艺乐园 ------ 13课时 试听 100元/门 购买
边玩边学 ------ 10课时 试听 60元/门 购买
情景喜剧 ------ 15课时 试听 100元/门 购买
欢乐课堂 ------ 35课时 试听 150元/门 购买
基础英语辅导课程
郭俊霞 北京语言大学毕业,专业英语八级,国内某知名中学英语教研组组长,教学标兵……详情>>
郭俊霞:零基础英语网上辅导名师

  1、凡本网注明 “来源:外语教育网”的所有作品,版权均属外语教育网所有,未经本网授权不得转载、链接、转贴或以其他方式使用;已经本网授权的,应在授权范围内使用,且必须注明“来源:外语教育网”。违反上述声明者,本网将追究其法律责任。
  2、本网部分资料为网上搜集转载,均尽力标明作者和出处。对于本网刊载作品涉及版权等问题的,请作者与本网站联系,本网站核实确认后会尽快予以处理。本网转载之作品,并不意味着认同该作品的观点或真实性。如其他媒体、网站或个人转载使用,请与著作权人联系,并自负法律责任。
  3、联系方式
  编辑信箱:for68@chinaacc.com
  电话:010-82319999-2371