household size is far from being normally distributed; it is right skewed. Nonetheless, according to the central limit theorem, the samplingdistribution of the sample mean can be approximated by a normal distri
The sampling distribution of the sample mean is close to the normal distribution(A) only if both the original population has a normal distribution and n is large.(B) if the standard deviation of the original population is known.(C) if n is large, no matter what the distribution of the ...
proportion=比例 sampling distribution of the sample mean 样本均值抽样分布 样本均值的抽样分布即所有样本均值的可能取值形成的概率分布。例如，某高校大一年级参加英语四级考试的人数为6000人，为了研究这6000人的平均考分，欲从中随机抽取500人组成样本进行观察。若逐一抽取全部可能样本，并计算出每个样本的...
我们把这种分布称为 样本均值的抽样分布 (sampling distribution of the sample mean) ,它是这样一种分布:你从总体中无限抽取样本,计算所有样本的均值。 目前为止,你应当意识到,在实际的研究中,我们不可能从某个总体中抽取无限多的样本。但是,你需要知道,如果我们能这么做,这个分布的均值将等于总体的均值,这正是...
Laplace's solution was to appeal to his central limit theorem, which says that under very general conditions, even if observations are randomly sampled from a nonnormal distribution, the sampling distribution of the sample mean approaches a normal distribution as the sample size gets large....
–Sample 1 – we compute sample mean x 1 –Sample 2 – we compute sample mean x 2 –Sample 3 – we compute sample mean x 3 –Etc. • Each time we sample, we may get a different result • The sample mean is a random variable! X Distribution of Sample Mean • Beca...
mean v.[T] 1.(词语等)表示...的意思,作...解释 2. 意指,意谓 3. 意味着,即是 4. 意欲,打算;怀有 5. 预定;注定;指定 6. 引起,造成 v.[I] 1. 怀 distribution n. 1.分发,分配 2.散布,分布 3.分配;分布 4.(商品)运销,经销,分销 5.按比例分配;分配法;分发方式 6.分配物,配给物;分...
百度试题 题目As a general rule, the normal distribution is used to approximate the sampling distribution of the sample mean only if 相关知识点: 试题来源: 解析 the sample size n is sufficiently large 反馈 收藏
C The central limit theorem tells us that for a population with a mean m and a finite variance σ2, the sampling distribution of the sample means of all possible samples of size n will approach a normal distribution with a mean equal to m and a variance equal toas n gets larger. 反馈...
用样本估计总体是有难度的,即使样本数非常少(population为1000samples为50)Introducing the sampling distribution of the sample mean with an example that isboth realistic and concrete is diffificult because even for moderately large populationsthe number of possible samples is enormous, thus prohibiting an ...