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
2010-01-10
78
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 continuumor the data may represent qualitative variables, such as sex, college major, or personality typo. 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 inefficient 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。
转载请注明原文地址:https://kaotiyun.com/show/Zv6K777K
0
专业英语四级
相关试题推荐
他们没有房子住。
“有一个人,终生在寻求生活的意义,直到最后,他才明白,人生的真谛实质是十分简单,就只是自食其力。”星星在很高很远的天上一闪一闪,端丽忽然想哭,她好久没哭了,生活里尽是好事,高兴的事,用不着眼泪。“用自己的力量,将生命的小船渡到彼岸……。
Thereareanumberofbeautycontestsacrosstheworld,themostfamousperhapsbeingtheMissWorldPageant.Somepeoplebeliev
Recently,somepeoplearguethatcorporalpunishmentshouldbere-introducedtotheeducationsystemforitwasaneffectiveway
NowChinahasabout20girls’middleschools,mostofwhichareownedbygovernment.Theonlyprivateonewasestablishedrecent
(1)Wasthesummitasuccess?Itdependsonthestandardsyouusetomeasureit.CertainlybythestandardsofpreviousG8summit
(1)Wasthesummitasuccess?Itdependsonthestandardsyouusetomeasureit.CertainlybythestandardsofpreviousG8summit
(1)DirectorsofOccidentalPetroleumCorp.wanttokeepChiefExecutiveRayR.Iranisafe.Sotheyspent$774,756lastyearonh
(1)Substantialchangesinthenation’smadcowtestingsystemwereorderedyesterdayafterBritishtestsonacowslaughteredin
Whatmightdrivingonanautomatedhighwaybelike?TheanswerdependsonwhatkindofsystemisultimatelyadoptedTwodist
随机试题
A.腹股沟斜疝B.睾丸鞘膜积液C.睾丸肿瘤D.附睾结核E.慢性附睾炎阴囊肿大,有时可见肠型,卧位时回纳,透光试验阴性
患者,男,15岁。上感后全身水肿,尿蛋白定量6g/24h,尿红细胞(一),血白蛋白19g/L,C3正常,最可能的病理类型是
A、苏颂B、李时珍C、赵学敏D、唐慎微E、陶弘景《图经本草》的作者是
外文缩写“qod”表示()。
边坡的坡向与岩层的倾向相反的边坡称作:
FIDIC施工合同条件中关于工程变更权的表述不正确的是()。
为了确保银行的财务报告公允地反映公司的财务状况以及公司在各重要方面的表现,董事会和高级管理层可使用外部审计师,下列关于外部审计范围的表述错误的是()。
我国房地产管理法是调整城市规划区内国有土地范围内房地产权属关系,以及房地产()管理中发生的经济关系的法律规范的总称。
不合格品是指()。
Directions:Basedontheinformationgivenbelow,pleasewriteanessayofabout600wordsontheanswersheet.Youhave60minu
最新回复
(
0
)