作者alex2014 (绿影)
看板Statistics
标题[讨论] 询问几题统计问题!
时间Mon Feb 1 09:55:45 2010
ture or false . Justify your answer
1. If m is the median of X , then it must be the case that
P(X≦m) = P(X≧m) = 0.5
答案是False , 但是该如何解释? 又到底错在哪儿?
consider the following questions regarding sampling.
a. The process of acquiring data incurs costs and such costs are often
proporition to the sample size .Yet,we desire to have a lager sample
size , if cost of the sampling is manageable. Why ?
Please give explanations from the viewpoint of statistics.
b. The sampling error is inevitable in sampling . But ,assessing the
sampling error is not trival because the population paramter considered
is unknown . What would be your assessment of the sampling error ?
Please elaborate it.
以上两题属於解释题型,可能需要较详细的解答过程!
麻烦各位统计高手的协助了!
祝大家学业进步
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1F：推 peiwinds:老实说第一题我觉得是True耶....XD 02/01 19:19
2F：→ peiwinds:因为中位数就是第50百分位数阿 02/01 19:20
3F：推 TOOYA:如果是离散随机变数 就不是 02/01 21:20
4F：→ yhliu:1. "=0.5" 改成 "=0.5" 才对. 02/01 22:04
5F：→ yhliu:a. 因样本愈大抽样误差愈小. 02/01 22:05
6F：→ yhliu:b. 用样本估计群体参数(群体特性", 而後可估计抽样误差. 02/01 22:06
7F：→ yhliu:详细回答还是有赖於自己多读、多思考相关教本内容. 02/01 22:07