STAT 3743 Daily Outline
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More about pvalues
Standard error of the sample mean
Standard errors in general
For variances
Tests of hypothesis for a variance
Example: salary
from RcmdrTestDrive
How to do it with R
sigma.test
from the TeachingDemos
package
For two means and/or two variances
For two means
Independent twosample ttest (pooled)
Example: mean before
by smoking
in RcmdrTestDrive
Remarks
 twosample ztest
 large sample approximation
For two variances
Twosample Ftest
Example: variance of before
by smoking
in RcmdrTestDrive
How to do it with R
var.test
from base R
Date: 20101203 15:01:17 EST
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