The students of senior secondary those are opting for economics are expected to develop insight into statistics because economics regenerates into solution with the aid of data. Economics which is positive positive in nature demands search of recommendation which requires data. Therefore data science itself is not easy for the students to understand the nature of data, it's organisation and then analysis. In this book data collection, tabulation, arrangement and presentation has been systematically explained for all the students without having to confront with novelty of the data. In this book graphical presentation of the data has been eloquently explained so that students can get at a glance the pictorial presentation of data and get broader idea as to what idea data should give. Measures of central tendency have been beautifully elucidated. The need for correlation is felt at every stage of data analysis. Therefore correlation and rank correlation coefficient with illustration have also been explained. The chapter on index numbers has got serious relevance. The concept of index numbers and its application when the students will read would be highly fascinating.