Question 1191864
The test statistic is delta mean/sqrt (V)
the numerator is m1-m2=-9.1
the denominator is sqrt {(s1^2/n1)+(s2^2/n2)}=sqrt (12.14)=3.48
the test statistic is -2.612
the critical value is for t(0.0001, df=29)=-3.396
p-value is 0.0141