Unformatted text preview: tions for a twosample t – test are:
1. We have two independent SRSs, from two distinct populations and we measure the same
variable for both samples.
2. Both populations are normally distributed with unknown means and standard deviations. (Or if
each given sample size is greater than or equal to 30.)
Twosample t – test statistic: t= ( x1 − x2 ) − ( µ1 − µ2 )
2
s12 s2
+
n1 n2 The degrees of freedom is equal to the smaller of n1 − 1 and n2 − 1 . Example:
1.
The president of an allfemale school stated in an interview that she was sure that the students at
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This document was uploaded on 02/26/2014 for the course MATH 2311 at University of Houston.
 Spring '08
 HAFEEZ

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