Single-factor independent groups design
This chapter discusses the principles of analysis of variance for the single-factor design. It provides an account of the logic of the process for making a decision about the possible existence of an effect of time pressure on recall. The chapter illustrates by their application to a new example of the single-factor design and presents convenient formulae for hand calculation of the analysis. It explores the assumptions which underlie the analysis of the single-factor design and shows that a precise mathematical model is assumed which relates the independent variable to the dependent variable. The aim of the experiment was to enable a decision to be made as to whether time pressure, the independent variable, caused changes in the number of words recalled, the dependent variable. In the example referred to previously this is equivalent to the different amounts of time pressure having identical effects on the number of words recalled.