Statistics is not presented here as a branch of mathematics but as a logical commonsense development from very simple beginnings. The difficulties, such as they are, do not lie in mathematical manipulation but in grasping a few simple but unfamiliar concepts. Learning to apply statistical methods is rather like learning to swim or drive a car. One does not become fully proficient immediately and certainly not by just reading and thinking about it. Practical experience is all important. Through practical experience one acquires practical skills and real understanding.

Do not wait until you have some numerical data to analyse before turning to this book. Start now, at the beginning, and try to understand why biologists need to think in terms of statistics and to employ statistical methods. Then, whether you are convinced or not, work steadily on through the book. Master each section as you go, attempt all the problems at the ends of the chapters, and check your numerical solutions and logical conclusions with the solutions provided. You will not regret making the effort: the understanding and skill that you acquire will be of lasting value to you, both in your biological work and outside.