查询词典 population statistics

From statistics, the theorem that the distribution of sample means taken from a large population approaches a normal, Gaussian, curve.

根据此定理，统计抽样的样本量越大，则随机选择的样本平均值越接近于正态分布。

It is a refereed, broad-spectrum journal publishing basic research in diverse disciplines in biology and varied taxa. The journal publishes papers from major topics:animal, vegetation and plant population in ecology, mammalogy, animal behavior, herpetology, ornithology, aquatic ecology, parasitology, ichthyology, plant physiology and biological statistics.

它发表的文章内容囊括了生物学领域的各门学科的基础研究内容，比如：动物学，植被学，生态植物种群，哺乳动物学，动物行为学，爬虫学，鸟类学，水生生态学，寄生虫学，鱼类学，植物生理学和生物统计学等。

Inferential statistics is used to model patterns in the data, randomness and drawing inferences about the larger population.

统计推断是用来示范模式的数据，占随机性和借鉴推论有关的人口。

Inferential statistics, to be discussed in this article, can be used to make predictions based on a sample obtained from a population or some large body of information.

将在这篇文章中讨论的推论统计学能够从基于一个总体或一大堆信息中获得的一个样本进行预测。

In addition, patterns in the data may be modeled in a way that randomness and uncertainty in the observations, and are then used to draw inferences about the process or population being studied; this is called inferential statistics .

此外，模式的数据可能被模仿的方式，占随机性和不确定性的意见，并随后用于举一反三的过程或正在研究的人口，这就是所谓的统计推断。

Other major figures in statistics: John Graunt (introduced the concept of inference from a sample to an underlying population and described life expectancy); Karl Friedrich Gauss (developed modern statistical reasoning); the 18th-century English theologian Thomas Bayes (showed how probability can be used in inductive reasoning); Sir Ronald Fisher (the principle of randomization as a method for avoiding bias in studies); and Jerzy Neyman (the theories of estimation and testing).

其他统计学上的重要人物：John Graunt（从一项潜在的人口数和描述预期寿命的样本中引进了推论的概念）；Karl Friedrich Gauss；18世纪英国神学者Thomas Bayes（示范了如何将概率应用到归纳推论中）；Sir Ronald Fisher（随机化原则，一种避免研究中的偏移的方法）；还有Jerzy Neyman

Graunt also was the first person to use mortality statistics to project population survival, probably by crudely fitting data samples to a logarithmic curve.

Graunt还是运用死亡率统计大致通过粗略匹配数据样本集勾画一条对数曲线来估算人群生存期的第一人。

However, methods of mathematical statistics and comprehensive analysis of influencing factors are not enough to studies of population quality of one city.

但是，就一个城市的人口素质研究而言，数理统计的方法与影响因素的综合分析研究还不多见。

Based on consider hereinbefore, this dissertation discusses several aspects on the problem of the sustainable and optimum exploitation of groundwater resources as follows:①reviewed entirely the origin and evolvement of the concept "sustainable development", stated and commented the study status in queue on"sustainable development"around national and international range, thorough discussed the science connotation about the concept "sustainable development";②looked back and commented across-the aboard some furthest basic concept and proposition related to groundwater resources, put forward self opinions on a few existent mistake points of view and chaos understandings;③expatiated entirely on the content and meaning of the theory of changeable groundwater resources system, contrast with the traditional methods of groundwater resources calculation and evaluation, combined example to show the application of this theory;④thorough analyzed the difficult and complexity to forecast the groundwater resources, fully stated the traditional methods of groundwater resources forecasting, pointed out the characteristic and applying condition of these forecasting method, introduced the main ideas and methods of wavelet analysis developed recently, and the MATLAB software be known as the fifths era computer language, and its accessory wavelet analysis toolbox, applied these methods and tools to analyze the groundwater dynamic curve, adopted the B-J method and Morte-Carlo method, combined with the theory of changeable groundwater resources system, discussed the new view on the forecast of groundwater resources;⑤synthetically analyzed the characteristics and limitations of the present all kind of groundwater manage model, combined mathematical programming, mathematical statistics, random process and the theory of variation system of groundwater resources on the unite optimum attempter of surface water and groundwater, emphasized how to make the model more nicety, more simple, more practicality;⑥analyzed the inside condition and outside condition to assure the sustainable and optimum exploitation of groundwater resources, the inside conditions are the follows: correct resources idea, scientific methods of resources calculation and evaluation, credible forecast methods of resources, exercisable measures of resources management, the outside conditions are the follows: the development idea of high layer, the transform of manage system, the matched policy and rule of law, the adjusted of economy lever, the improve of cultural diathesis, the boosting up of water-saving consciousness and detail measures, the control of population rising, the prevention and cure of water pollute, the renew and rebuild of ecology;⑦scan the sustainable and optimum exploitation of groundwater resources from the high level of metagalaxy, earth system science, and philosophy;⑧point out the more directions on groundwater resources.

它将为制定水资源的可持续发展目标和战略决策提供科学依据，为制定社会、经济可持续发展战略提供理论基础。基于以上考虑，论文主要从以下几方面对地下水资源可持续开发问题进行了比较深入的探讨：①全面回顾了"可持续发展"概念的由来与演变，对国内外"可持续发展"的研究现状进行了述评，并对"可持续发展"概念的科学内涵进行了深入探讨；②对涉及地下水资源的一些最基本的概念和命题进行了全面的回顾和评述，对目前仍然存在的一些错误观点和混乱认识提出了自己的见解；③全面阐述了地下水资源变值系统理论的内容和意义，并与传统的地下水资源计算评价方法进行了对比分析，结合实例具体说明了方法的应用；④深入分析了地下水资源预测预报工作的极端重要性和复杂性，对传统的地下水资源动态预测方法进行了全面的评述，指出了各类预测预报方法的特点及适用条件，对最近二十多年刚发展起来的小波分析技术的主要思想和方法及其应用范围，以及号称第五代计算机语言的MATLAB软件和附带的小波分析工具箱进行了介绍，并应用于地下水动态过程线的分析，采用时间序列中的B-J法，蒙特卡罗方法，与地下水资源变值系统理论相结合，探讨了地下水动态资料分析和地下水资源预测预报的新思路；⑤综合分析了现今各类地下水管理模型的特点及缺陷，将数学规划、数理统计、随机过程等与地下水变值系统理论相结合进行地表水地下水或多水源的联合优化调度，使模型更准确、更实用；⑥对保证地下水资源可持续开发的内部条件和外部条件进行了分析，内部条件主要是正确的资源观，科学的资源计算与评价方法，可靠的资源预测预报技术，可操作的资源管理措施，外部条件主要是高层发展思路、管理体制的变革、配套的政策法规、经济杠杆的调节、人文素质的提高、节水意识的增强及具体节水措施、人口增长的控制、水体污染的防治、生态的恢复和重建等；⑦从宇宙科学、地球系统科学及哲学的高度审视地下水资源的可持续开发；⑧指出了地下水资源可持续开发的进一步研究方向。

Per capita emissions statistics are used mischievously - China's population is 20 times greater than that of the UK, so its government presides over more pollution than that of the UK.

此文的人均排放统计玩得好---可中国人口是英国的20倍，其政府辖下的污染要比英国政府辖下的多。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。