Homework:




Two sample t-test:



Given X1, X2 ....Xn  and 
      Y1, Y2 ....Ym

the test statistic is      ( X bar - Y bar )/

Ho: \mu1 = \mu2



What if the Y-sample is available only as sums of a few individual obs. a piece. for example
we only have the data as sums of 3-Y's.

Can we still get a valid T-test?