[問題] 台大商研97統計
※ [本文轉錄自 Grad-ProbAsk 看板]
作者: bluelazzy (加油!!) 看板: Grad-ProbAsk
標題: [問題] 台大商研97統計
時間: 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. 這題我有點看不懂題意,想請教大家一下
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?
這題答案是d.0.0256
但是我算出來的答案是0.02326 不過沒有這個選項
可以麻煩高手幫忙解答一下嗎？謝謝！
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.
但是我覺得是a. 我的想法是當α減少時,β會增加,又power=1-β
所以power減少
請問我的推論哪裡出錯了,還是解答有錯？
麻煩大家幫我看看,謝謝囉!
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