问一道统计学问题：英文Suppose a population has a mean of 90 and a standard deviation of 28.If a random sample of size 49 is drawn from the population,the probability of drawing a sample with a mean of more than 95 is _________ .Select one:

来源：学生作业帮助网 编辑：六六作业网 时间：2024/12/19 10:01:36
问一道统计学问题：英文Supposeapopulationhasameanof90andastandarddeviationof28.Ifarandomsampleofsize49isdrawnfro

问一道统计学问题：英文Suppose a population has a mean of 90 and a standard deviation of 28.If a random sample of size 49 is drawn from the population,the probability of drawing a sample with a mean of more than 95 is _________ .Select one:
问一道统计学问题：英文
Suppose a population has a mean of 90 and a standard deviation of 28.If a random sample of size 49 is drawn from the population,the probability of
drawing a sample with a mean of more than 95 is _________ .
Select one:
a.0.3944
b.1.0000
c.0.8944
d.0.4286
e.0.1056
我总觉得是a,但是不是应该X2的吗?为什么?

问一道统计学问题：英文Suppose a population has a mean of 90 and a standard deviation of 28.If a random sample of size 49 is drawn from the population,the probability of drawing a sample with a mean of more than 95 is _________ .Select one:
e
因为u=(95-90)/(28/√49)=1.25,查表得P=0.056 .

还是先翻译成中文吧，平均值90 标准差28
取出一个49个的样本，样本均值大于95的概率是多少？
利用中心极限定理
p(x>95)=1-p(x<95)=1-p[(x-90)/(28/√49)<(95-90)/(28/√49)]
=1-z[(95-90)/(28/√49)]=1-z(5/4)=1-0.8943=0.1057
我觉得你可以再看看中心极限定理，...

全部展开

还是先翻译成中文吧，平均值90 标准差28
取出一个49个的样本，样本均值大于95的概率是多少？
利用中心极限定理
p(x>95)=1-p(x<95)=1-p[(x-90)/(28/√49)<(95-90)/(28/√49)]
=1-z[(95-90)/(28/√49)]=1-z(5/4)=1-0.8943=0.1057
我觉得你可以再看看中心极限定理，要求的是均值大于95的概率，因此直接根据中心极限定理转化成标准正态来求解即可。

收起

问一道统计学问题：英文Suppose a population has a mean of 90 and a standard deviation of 28.If a random sample of size 49 is drawn from the population,the probability of drawing a sample with a mean of more than 95 is _________ .Select one: 求教一道统计学数学题.Suppose X and Y are random variables such that the atandard deviation of X is 2 and the standard deviation of Y is 5.Consider a random variable Z defined as Z=3X-2Y+5.问 a:Assume that X and Y are independtly distribute 问一道统计学的概率分布图问题（英文）The volume of liquid in an unopened 1-gallon can of paint is an example of ___________ .有四个选项：A.the binomial distributionB.a discrete random variableC.a constantD.a continuous random v 问一道统计学问题（英文）?急Manuel Banales,Marketing Director of Plano Power Plants,Inc.'s Electrical Division,is directing a study to identify and assess the relative importance of product features.Manuel directs his staff to design a su 关联分析问英文怎么说?（统计学上的） 问一道宏观经济学的英文考试题Suppose that you are a lender.The real interest rate (r) now increases from 2% to4%.Explain how this event will affect the fraction of income you choose toconsume and to save.Assume that you have to save to f 一道关于统计学方面的英文问题.As I demonstrated on class, there is a negative correlation between number of children and the dummy of female in the data set I created on class. Such a correlation is statistically significant. On the othe 英文统计学题 问一些问题英文 统计学参数估计问题 统计学的基本问题 问一道线性代数的问题 不定积分的问题一道问： 一道数学题,关于拉格朗日中值定理的,最好英文,中文也可以~Suppose that f(x) has second derivative in (a,b),and f(x1)=f(x2)=f(x3)where a suppose的问题--I hit a tree yesterday.--I suppose you ____ too fast.a.drive b.drove c.are driving d.were driving选哪一个?为什么? 谓语动词问题I suppose it's a family中suppose 和 is 都是谓语动词吗 一句话中不是只有一个谓语动词吗 请问是怎么回事 问他们老师问题.英文 统计学问题：什么是时间数列?