Most statistics textbooks concentrate on theoretical discussions and mathematical proofs of the various concepts presented. The result of this approach is that students often have little understanding of how actually to apply statistical tests to their experimental ?ndings. The intent of this book is to reverse this approach and to present statistical concepts and tests as they are applied. Our experience has indicated that carefully worked and clearly described examples can be easily generalized to a wide variety of situations. Consequently, the method of presentation employed throughout this book is based primarily on the technique of teaching by example. The mathematical proofs and theoretical discussions that appear in most textbooks are, for the most part, excluded. What has been substi- tuted is a step-by-step analysis of the computational procedures needed to test the signi?cance of experimental ?ndings. Each test or analysis is illustrated by a clearly worked example, and all computational steps and procedures are expressed verbally rather than in mathematical symbols. Thus, while the analyses range from the simplest t-test or correlation to the most complex analysis of variance or multiple correlation, almost no previous mathematical knowledge is required to use this book effectively. Copyright 1968. Spine uncreased, corners sharp. Some shelf wear. Owners name on inside cover page and a stamped code in same location. Book is otherwise unmarked.