首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
There were two widely divergent influences on the early development of statistical methods. Statistics had a mother who was dedi
There were two widely divergent influences on the early development of statistical methods. Statistics had a mother who was dedi
admin
2010-01-26
35
问题
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 governmental units (state 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.
Descriptive statistics involves tabulating, depicting, and describing collections of data. These data may be either 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 reducing to comprehensibly 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 difficulties for the unaided human mind. This general class 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 inefficiency to question each child; the proportion for the entire district could be estimated fairly accurately from a 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.
Which of the following statements is true about descriptive statistics?
选项
A、It combines quantitative variables and qualitative variables.
B、It can be used to deal with only quantitative variables.
C、It helps to summarize properties of a group of data.
D、It helps to make predictions using a sample of observations.
答案
C
解析
仔细比较四个选项。A“它将数量变量和质量变量结合起来了”,这误解了第二段中第二句话“either...or…”句型,要么是数量变量,要么是质量变量;B“它只能用来处理数量变量”,也与上面句型含义相悖;C“它有助于总结一组数据的特征”,这正是第二段最后一句话“Large masses of data… the properties of an otherwise unwieldy mass of data.”的含义;D“它有助于使用观察抽样进行预测”,这是推理性统计。所以选C。
转载请注明原文地址:https://kaotiyun.com/show/qDdK777K
0
大学英语六级
相关试题推荐
ItisknowntousthatEnglishisnotasoldasChinese,butitiswidelyusedbymostpeopleallovertheworld.Englishspeake
ItisknowntousthatEnglishisnotasoldasChinese,butitiswidelyusedbymostpeopleallovertheworld.Englishspeake
Itisimportantforjobseekerstoknowthecultureofacompany________termsofitsattitudetotraininganddevelopment.
A、Theycostless.B、Theytastedbetter.C、Theywereinfashion.D、Theywerewidelyadvertised.AWhydidsparklingwinesbecomem
Thefather_______________________________(哀求)hissontobelesstroubletohismother.
Theterminvestmentportfolioconjuresupvisionsofthetrulyrich—theRockefellers,theWal-MartWaltons,BillGates.Buttoda
Chinahasoutlinedanewapproachtoforeigninvestment,withplannerssayingtheywillnowfocuslessonattractinglargeamoun
Chinahasoutlinedanewapproachtoforeigninvestment,withplannerssayingtheywillnowfocuslessonattractinglargeamoun
随机试题
A.维拉帕米B.胺碘酮C.美西律D.拉贝洛尔E.普鲁卡因胺属于延长动作电位时程药(第Ⅲ类)的抗心律失常药是
下列不属于推动金融衍生工具迅速发展的原因是()
临床医生在给患者进行治疗时,常采用药物的合并用药,合并用药的四个原则是
尿毒症最早出现的症状是()。
根据我国法律规定,星海公司申请执行仲裁裁决,下列人民法院中有管辖权的是:根据《民事诉讼法》的有关规定,下列情形中人民法院裁定仲裁裁决不予执行的有:
在开发项目()阶段开始委托物业代理机构,则更有利于代理工作的开展。
关于说服过程,下列说法不正确的是()。
关于《物业管理条例》立法指导思想的说法,正确的是()
体育教学中,在学生人数多,新授教材比较难,复习教材也比较复杂的情况下可采用()。
行政诉讼中,起诉状副本送达被告后,下列关于行政诉讼程序的说法正确的是()。
最新回复
(
0
)