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data _null_;
input x1 s1 n1 x2 s2 n2;
t=abs(x1-x2)/sqrt((1/n1+1/n2)*((n1-1)*s1**2+(n2-1)*s2**2)/(n1+n2-2));
p=1-probt(t,(n1+n2-2));
put t=;
put p=;
datalines;
6.21 1.85 25 8.56 1.79 25
5.67 1.72 25 8.56 1.79 25
;
run;
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