43.Statistics
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 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 censusesall 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.
2017届高考英语一轮单元总复习教案精品荟萃:外研版必修五Module 4《Carnival》
山东济宁一中2017届高考高三英语二轮复习课件:专题一 冠词和名词
2017届高考英语一轮单元总复习教案精品荟萃:外研版必修四Module 5《 A Trip Along the Three Gorges》
山西省2017高考英语二轮复习专题训练:阅读理解(78)
2017届高考英语一轮单元总复习教案精品荟萃:外研版选修六Module 1《Small Talk》
2017届高考英语一轮单元总复习教案精品荟萃:外研版必修五Module 2《A Job Worth Doing》
2017届高考英语一轮单元总复习教案精品荟萃:外研版必修一Module 6《The Internet and Telecommunications》
2017届高考英语一轮单元总复习教案精品荟萃:外研版必修五Module 3《Adventure in Literature and the Cinema》
2017届高考英语一轮单元总复习教案精品荟萃:外研版选修八Module 2《The Renaissance》
2017届高考英语一轮单元总复习教案精品荟萃:外研版选修六Module 3《Interpersonal Relationships—Friendship》
山西省2017高考英语二轮复习专题训练:阅读理解(54)
山西省2017高考英语二轮复习专题训练:阅读理解(39)
山西省2017高考英语二轮复习专题训练:阅读理解(60)
山东济宁一中2017届高考高三英语二轮复习课件:专题九 并列句和状语从句
2017届高考英语一轮单元总复习教案精品荟萃:外研版必修四Module 4《Great Scientists》
山西省2017高考英语二轮复习专题训练:阅读理解(46)
山西省2017高考英语二轮复习专题训练:阅读理解(43)
2017届高考英语一轮单元总复习教案精品荟萃:外研版必修五Module 6《Animals in Danger》
山东济宁一中2017届高考高三英语二轮复习课件:专题五 动词的时态和语态
山东济宁一中2017届高考高三英语二轮复习课件:专题六 非谓语动词
2017届高考英语一轮单元总复习教案精品荟萃:外研版必修三Module 6《Old and New》
2017届高考英语一轮单元总复习教案精品荟萃:外研版选修八Module 6《The Tang Poems》
2017届高考英语一轮单元总复习教案精品荟萃:外研版必修四Module 3《Body Language and Non-verbal Communication》
2017届高考英语一轮单元总复习教案精品荟萃:外研版选修八Module 4《Which English》
山西省2017高考英语二轮复习专题训练:阅读理解(61)
2017届高考英语一轮单元总复习教案精品荟萃:外研版选修六Module 6《War and Peace》
2017届高考英语一轮单元总复习教案精品荟萃:外研版必修一Module 5《A Lesson in a Lab》
2017届高考英语一轮单元总复习教案精品荟萃:外研版选修六Module 5《Cloning》
2017届高考英语一轮单元总复习教案精品荟萃:外研版必修四Module 1《Life in the Future》
2017届高考英语一轮单元总复习教案精品荟萃:外研版必修一Module 2《My New Teachers》
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |