Experimental design is one of the most fundamental topics in social science statistics. This book introduces the reader to the elements of experimental design and analysis through careful explanations of the procedures as well as through illustrations using actual examples. Clearly written, the text covers such topics as the fundamental concept of variability, hypothesis testing, the logic of the t test, how ANOVA can be extended to the multi-group situation and completely randomized designs. Throughout this volume the authors show the reader how to select an experimental design based on the number of independent variables, the source and number of extraneous variables, the number of subjects and the questions about the independent variables that require answers. The level is appropriate for anyone familiar with the concepts of central tendency, variability and correlation.