Statistics as a discipline is the development and application of methods to collect, analyse and interpret data. Modern statistical methods involve the design and analysis of experiments and surveys, the quantification of biological, social and scientific phenomenon and the application of statistical principles to understand more about the world around us. Since data are used in most areas of human endeavour, the theory and methods of modern statistics have been applied to a wide variety of fields. Some areas that use modern statistical methods are the medical, biological and social sciences, economics, finance, marketing research, manufacturing and management, government, research institutes and many more. Exciting new areas are opening up, due to developments in areas such as biotechnology, survey research and computing. This book has been written by the author in such a manner that even a layman could be able to understand the subject in detail and can use when ever required. The language used in quite easy and the examples quoted are very helpful in understanding the subject.