This started as a simple discussion where everyone thought they new the answer, and ended up with arguments and dozens of paper quotations. Thoughts appreciated.
We have 10 samples: Control, A, B, C, ..., I, with good enough sample size, and the groups have similar variances.
The following comparisons were made using unpaired two-sided t-tests:
A - Control
B - Control
C - Control
I - Control
We obtained 9 p-values. Do we have to adjust these p-values to account for family-wise issues ?