查询词典 sampling distribution

A result that may be useful for part II is that if X is a continuous random variable taking positive values with cumulative distribution function F and Rn is the range of a sample of size n taken from this distribution, then

一个结果可能对第二部份有用，如果X是连续自由变量并取正值带有累积分配方程F 且Rn是取样数量范围n且Rn来自于这个分布，然后

Normal distribution in statistics is based on the probability density function in the form of representation, and set up a continuous random variable X, the probability density function f has the form of Figure 1, where a, b are constants and were known as the average value and standard deviation,π, e, respectively pi and natural constants, claimed that X subject to parameters a, b of the normal distribution.

正态分布在统计学中是以概率密度函数的形式表述的，设连续型随机变量X的概率密度函数f有图1中的形式，其中a、b为常数，分别被称为平均值和标准差，π、e 分别为圆周率和自然常数，则称X服从参数为a，b的正态分布。

The text introduces the probability of random events and issues of counter-examples; discrete random variables related to the distribution and continuous random variable distribution of counter-examples; independence and related issues in the Phase capacitive on the counter-examples; number of characteristics of the random variable The counter-examples of; parameters estimates and assumptions in the anti-testing case of problems.

该文主要介绍了随机事件及其概率问题中的反例；有关离散型随机变量分布和连续型随机变量分布中的反例问题；独立性与相关性相容性问题中的反例介绍；有关随机变量数字特征的反例探讨；有关参数估计与假设检验中的反例问题。

Rinted-circuit board air-core coils designed by using CAD tools and fabricated by adopting advanced PCB manufacturing technology are good in measurement accuracy and consistence of products parameters. But the characteristics of limited turns-density and large magnetic induction intensity grads on coil cross-section make great influence on the continuous uniform distribution of coil turns along the coil circumference and cause its discrete distribution.

CB空心线圈采用CAD方法设计和先进的PCB加工工艺制造，具有很好的测量精度和参数一致性，但是，线匝密度较小，而且截面上磁感应强度梯度较大，从而影响了线匝沿圆周均匀分布的连续性，使其具有了离散分布特征。

Distribution Automation System is an integration system of supervisory control and management on distribution grid.

配电自动化是对配电网进行远方实时监视、控制与管理的一个集成系统。

It was found that the relationship between the nonsmooth appearance of leaf surface and its wettability is very strong, and the shape and distribution of the non-smooth elements are the decisive factors. The surface with regular distribution of convex elements presents large contact angle, strong water repellence, and good self-clearing ability, and that of hairy non-smooth elements takes the nextplace.

试验结果表明，植物表面具有的非光滑形态与表面润湿能力的强弱有极大的关系，非光滑单元体的形状和分布是影响植物表面憎水性强弱的决定性因素；规律分布凸包形非光滑单元体的植物表面的憎水性强，脱附效果好；规律密布表皮毛形非光滑单元体次之。

The comparison with conventional coplanar PDP has been made.The electric field distribution and the density distribution of particles at different time have been given.

给出了不同时刻两种结构放电单元中电场、各种粒子浓度的空间分布以及各种粒子的平均浓度随时间的变化关系。

Firstly, the self-owned business hall, one to one marketing channel and 1860 hotline are core. Secondly, franchising store, bank cooperation and post cooperation are main body. Thirdly, specified distribution store and its subsidiaries are main selling power. Fourthly, network business hall, self-help service system and phone-bundled distribution are new type service channels. Lastly, establish the multi-channels that the above-mentioned models exist together.Constructing the informative service marketing channels, utilizing the promoting and controlling methods, improving the efficiency of managing service marketing channels and the loyalty degree of social marketing channels, in a result, form the core competitiveness of Hunan Mobile Communication Company.

针对各种模式所服务的用户群体和服务手段，提出了以自办营业厅、一对一直接渠道和1860客户服务热线为核心，特许经营店和银行邮政合作为服务主体，指定专营店及其下辖的普通代理店等为主要销售力量，网上营业厅、自助服务系统和手机捆绑销售等为新型营销服务形式的多种形式并存的混合型服务营销渠道模式，以服务营销渠道信息化为手段，采取相应的激励和控制方法，提高服务营销渠道的管理效率和社会营销渠道的忠诚度，营造湖南移动通信公司的核心竞争优势。

When Ri increases, the effort in the molecular will increase, and molecular in the emulsion will crimple in group, the distribution of molecular weight in emulsion will widen and distribution degree increase.

利用预聚体封端接枝技术合成了具有优异贮存稳定性和耐水性的丙烯酸酯改性聚氨酯水分散体与丙烯酸酯-有机硅氧烷复合改性聚氨酯水分散体。

That is supposed that the intensity of cross section of the beam ejacted by accelerator is Gauss distribution,a fine measurement is operated to determine the peak of the Gauss distribution,and it is verified by experiment.

在假设加速器射出的束流横截面，其强度呈高斯分布的条件下，讨论分析了一种精细测量系统束流横截面强度分布的方法，并用实验对这种方法的正确性做了验证。

My father is over 60 years old, and he lifts weights every day.

我爸爸六十多岁了，他每天都练习举重。

Then in a serious tone she declared:"It doesn't pay, dear boy, to look like a ninny with one's wife the first night."

两眼湿润了，她把身子蜷得很小，这样似乎可以更好地闻闻自己。