My video about the life cycle of a sea biscuit is now online!
It must be emphasized that statistical hypotheses are to be stated before data are collected to test them. To propose hypotheses after examination of data can invalidate a statistical test. One may, however, legitimately formulate hypotheses after inspecting data if a new set of data is then collected with which to test the hypotheses.Book: Biostatistical Analysis (Third Edition)
Author: Jerrold H. Zar