首页
登录
职称英语
There were two widely divergent influences on the early development of stat
There were two widely divergent influences on the early development of stat
游客
2024-10-30
9
管理
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. [br] A sample of a population is often examined for the following purposes except ________.
选项
A、to make a more accurate prediction of trend
B、to improve efficiency and avoid unnecessary work
C、to save the trouble of approaching every members
D、to predict characteristics of the entire population
答案
A
解析
文章最后一段讲到抽样100个小孩来进行分析预测。A“进行更加准确的趋势预测”,抽样本身就不可能是为了更加“准确”,所以A错,应该选A。B“提高效率,避免不必要工作”,这正是抽样的作用;C“省去找每个成员的麻烦”,这也正是人口抽样的优势;D“预测全体人群的特征”,正是人口抽样的目的。
转载请注明原文地址:https://tihaiku.com/zcyy/3823658.html
相关试题推荐
Thereweretwowidelydivergentinfluencesontheearlydevelopmentofstat
Thereweretwowidelydivergentinfluencesontheearlydevelopmentofstat
Thereweretwowidelydivergentinfluencesontheearlydevelopmentofstat
Thereweretwowidelydivergentinfluencesontheearlydevelopmentofstat
Whendidthreemealsadaybecomeawidely-acceptednormatalllevelsofsociet
Whendidthreemealsadaybecomeawidely-acceptednormatalllevelsofsociet
Oneofmedicine’sfundamentalbeliefsaboutpregnancyandthedevelopmento
Oneofmedicine’sfundamentalbeliefsaboutpregnancyandthedevelopmento
NootherholidaythatistodaywidelyobservedinNorthAmericabassucha
NootherholidaythatistodaywidelyobservedinNorthAmericabassucha
随机试题
Ataroundageoffive,everychildhastomakethe【C1】______fromhometosch
苯妥英钠的特点是()A.刺激性大,不宜肌内注射 B.口服吸收慢而不规则 C
项目监理机构与委托人的沟通机制包括()。A.充分理解委托方的期望和要求,并体
生产、销售假药和劣药的区别是( )。A.罚款的数目不同 B.没收违法生产、销
A.绒毛有水肿变化 B.绒毛水肿,滋养细胞增生 C.滋养细胞侵入肌层,有出血
头痛烦躁,面红口苦,耳鸣胁痛,尿黄便秘,舌红苔黄燥,脉弦数,应诊断为A.肝火炽盛
有人说:“世界历史好比一百个大钱,你可以摆成两座五十的,也可以摆成四座二十五的,
1991-93.确定黄疸的主要依据是 A.身黄B.目黄C.舌苔黄D.小
1998-97痫证的表现为 A.突然昏倒,昏不知人,口吐涎沫,两目上视,四肢
(2014年真题)根据正常使用条件下,基础设施工程、房屋建筑的地基基础工程和主体
最新回复
(
0
)