Confidence Band question
- From: "hong" <wangyuhong@xxxxxxxxx>
- Date: 24 Aug 2005 08:26:58 -0700
I have a entry-level question about confidence band of standard normal
distribution.
According to the following webpage, for a standard normal distribution,
"...The critical values at the 5% significance level are -0.087 and
0.087..."
http://www.itl.nist.gov/div898/handbook/eda/section4/eda4283.htm
While on another webpage of the same site:
http://www.itl.nist.gov/div898/handbook/eda/section3/autocopl.htm
there is a formula to calculate the confidence band.
+/- z(1-alpha/2)/sqrt(N)
Say, alpha=0.05 ->z(1-alpha/2)=1.96
given the sample size N=195 (quoted from the first webpage)
I should have a confidence band (-0.14,0.14).
What did I do wrong? Where is the band (-0.087,0.087)from?
Thanks for your help!
.
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