作者bluelazzy (加油!!)
看板Statistics
标题[问题] 台大商研97统计
时间Tue Feb 17 21:43:13 2009
※ [本文转录自 Grad-ProbAsk 看板]
作者: bluelazzy (加油!!) 看板: Grad-ProbAsk
标题: [问题] 台大商研97统计
时间: Tue Feb 17 21:42:43 2009
2.When extreme values are present in a set of data,which of the following
descriptive summary measures are most appropriate?
a.Interquartile range and median
b.variance and CV
c.CV and range
d.Mean and standard deviation
答案是a. 这题我有点看不懂题意,想请教大家一下
7. On average,20% of the emergency room patients at hospital are students.
In a random sample of four patients,what is the probability that three of them
are students?
这题答案是d.0.0256
但是我算出来的答案是0.02326 不过没有这个选项
可以麻烦高手帮忙解答一下吗？谢谢！
15. For a given sample size,if the level of significance α is decreased,
the power of the test
a.will decrease
b.will increase
c.will remain the same
d.cannot be determined
答案是b.
但是我觉得是a. 我的想法是当α减少时,β会增加,又power=1-β
所以power减少
请问我的推论哪里出错了,还是解答有错？
麻烦大家帮我看看,谢谢罗!
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1F：→ hahakelly:15题应该是a没错 02/18 17:27
2F：推 LuciferJR:第7题~BIN(4 ; 0.2) P(x=3) 02/19 22:53