sp2 = ((n1 - 1)s1^2 + (n2 - 1)s2^2)/(n1 + n2 - 2)
= (29 * (10)^2 + 26 * (9)^2)/(10 + 9 - 2)
= 294.47
SE = sqrt(sp2 /n1 + sp2 /n2)
= sqrt(294.47/30 + 294.47/27)
= 4.552
The test statistic t = (M1 - M2)/SE
= (21.5 - 25.8)/4.552 = -0.94
THe t-statistic lies in the critical region, therefore null hypothesis is not rejected.
the two means are not different from each other.
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