This book contains all the essentials of Biostatistics, research methods, demography and health statistics that lay a good foundation for anyone interested in these subjects. It introduces both the basic and newer applications. With the developments in computers, though the practice of data management and statistical analysis has become easier, it is also fraught with dangers of misuse unless guided by correct statistical device. This book helps in this process, and devotes a few chapters to research methodology and determination of the best study designs and sample sizes as well as appropriate statistical tests of significance, including non-parametric tests. This text is intended for undergraduate and postgraduate medical students as well as for nursing and paramedical students. It would also be useful to medical/health faculty and researchers in the field of biostatistics.