On the use of Statistical Power in Examining Changes in Rainfall

The main objective of statistical analysis is to make inference. One way of doing this is through Hypothesis Testing and Post-hoc power analysis which can be applied to environmental phenomena such as rainfall. Rainfall is an important element in understanding the climatic condition of any environment. In this work, tests of hypothesis and post-hoc power analysis are carried out using monthly rainfall series between 1971-2014 from Nigeria. Stratified sampling was done to choose the stations that were used for the analysis. It can therefore be concluded that Nigeria is experienc ing rainfall changes that can be more observed from the climatic zones. Thus, post-hoc power analysis proved effi cient in examining change in rainfall series in this regard.