A First Course In Statistics

Statistics is the science of collecting, classifying, presenting, and interpreting data. Our society has developed into one where science and technology affect everything around us. Statistics is one of the most important of these scientific tools. Virtually all facets of our lives are affected by statistics. Statistics has become a necessary element in most academic fields including the sciences, engineering, business, political science, economics, psychology, sociology, education, medicine, nursing, and other health-related areas.
Statistics is the universal language of the sciences. Statistics is more than just a "kit of tools". As potential users of statistics; we need to master the "art" of using these tools correctly. Careful use of statistical methods enables us to:
(1)Accurately describe the findings of scientific research
(2) Make decisions and 
(3)Make estimations

Definition: Statistics is the science of collecting, classifying, presenting, analyzing and interpreting data.

The above definition covers the following:
1. Collection of data: The collection of data is the first step of statistical investigation.
2. Presentation: After the collection of data, they are presented in systematic form such as table and graphical form.
3. Analysis: After the collection and presentation of data, the next step is to analyze the data. To analyze the data we use average, median, regression, etc.
4. Interpretation: The last step is the interpretation of the result obtained from the analysis.