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【考研英语】43.Statistics  

2016-05-17 10:18:49|  分类: 【英语】写作 |  标签: |举报 |字号 订阅

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    There were two widely divergent influences on the early development of statistical1methods. Statistics had a mother who was dedicated2 to keeping orderly records of government units (states and statistics come from the same Latin root status) and a gentlemanlygambling3 father who relied on mathematics to increase his skill at playing the odds4 in games of chance. The influence of the mother on the offspring, statistics, is represented by counting, measuring, describing, tabulating5, 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, depicting6 and describing collections of data. These data may be quantitative7 such as measures of height, intelligence or grade level------variables that are characterized by an underlying8 continuum---or the data may representqualitative9 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 superintendent10 wishes to determine the proportion of children in a large school system who come to school without breakfast, have beenvaccinated11 for flu, or whatever. Having a little knowledge of statistics, the superintendent would know that it is unnecessary and inefficient12 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.
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