Rajeev Goswami was born in 1964 and had his entire education in Gwalior and Bhopal (Madhya Pradesh) He had passed all his examinations in the first division including M.Sc (Statistics). After passing out M.Sc in 1985 and computer diploma in 1986 he served as computer programmer for a few years before completing his Ph.D. in Genetics. He did not get any permanent job but has been teaching statistics to post graduate classes in various subjects like microbiology, genetics, limnology and botany as a temporary visiting faculty. The present book is an outcome of his teaching experience.