This book is a much focused mathematical treatment for the advance postgraduate and research levels. Chapter 1 introduces its readers to the concepts of pure and applied research and the relationship between experimental and non-experimental research. It gives a proper background and framework to understand the research design. In Chapter 3, hypotheses are very well defined, though they are not supported by adequate examples which can explain the quantitative and qualitative fomiation of hypotheses. Each chapter has been structured uniformly, which makes the understanding simpler by providing a bgkxil sequence of the thought process.