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(As this blog site does not support the formatting, there could be errors in the post.
This series is compiled from various resources on net . I have made changes wherever necessary to make it simple to understand. )

Measures of Central Tendency And Dispersion

2.1 Introduction

In this chapter we will study various types of data, methods of data collection , data representation and measures of central tendency.

First question is ‘What is data”? Data is a set of something that we want to know about the object or objects under study. For example if we want to study performance of students in an examination, set of marks obtained by students will be our data.

Data can be gathered by different methods which we will study in detail in this chapter. After collection of data we need to classify the data to know, as in above case, the performance of the students and analyze that data to arrive at certain conclusions and finally we need to make presentation of our studies to the concerned authorities. Data representation usually precedes data analysis as we come to know various trends within the data through data representation.

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