Re: [商管] [統計]-求分配
※ 引述《LabaHowDa (喇叭好大)》之銘言：
: A random sample of 100 measurements is drawn from a population
: with a mean of 60 and a standard deviation of 5.
: (a)Describe the sampling distribution of the sample mean of 100 measurements
: _
: (denote by Yn)
: _
: (b)Based on (a), within what interval would you expect Yn to lie approximately
: 95% of the time ? (specify your notation)
: ------------------------------------------------------------------------------
: _
: (a)這題是寫 Yn→N(60,1/4) 就好了嗎？(這題10分)
應該正確吧@@ 10分的話它可能希望看到過程
E(X)=60
Var(X)=25
Ybar~N(60,25/100)=N(60,1/4)
: (b)這題是要我求信賴區間嗎？還是棄卻域？
是信賴區間@@
(Ybar-1.96*S/根號n , Ybar+1.96*S/根號n)
=(60-1.96*0.5 , 60+1.96*0.5)
=(59.02 , 60.98)
: 謝謝各位解答~
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