ABSTRACT
Introduction There has been a tendency for psychologists and other behavioural scientists to concentrate on whether a result is statistically significant, to the exclusion of any other statistical consideration (Cohen, 1962; Sedlmeier & Gigerenzer, 1989; Clark-Carter, 1997). Early descriptions of the method of hypothesis testing (e.g. Fisher, 1935) only involved the Null Hypothesis. This chapter deals with the consequences of this approach and describes additional techniques, which come from the ideas of Neyman and Pearson (1933), which can enable researchers to make more informed decisions.
