Diagrammatic Presentation of Data gives an immediate understanding of the real situation to be defined by data in comparison to the tabular presentation of data or textual representations. Diagrammatic presentation of data translates pretty effectively the highly complex ideas included in numbers into more concrete and quickly understandable form. Diagrams may be less certain but are much more efficient than tables in displaying the data. There are many kinds of diagrams in general use. Amongst them the significant ones are the following:
(i) Geometric diagram
(ii) Frequency diagram
(iii) Arithmetic line graph
You can also refer to the Meaning and Objective of Tabulation
BASICS OF DIAGRAMMATIC PRESENTATION
(A) CONCEPT OF DIAGRAMMATIC PRESENTATION 

(B) GENERAL GUIDELINES 

THEORY QUESTIONSANSWERS
Q.1 WHAT IS DIAGRAMMATIC PRESENTATION? DISCUSS THE ADVANTAGES OF DIAGRAMMATIC PRESENTATION.  
ANSWER:  
(A) DIAGRAMMATIC PRESENTATION  Diagrammatic presentation is a geometric technique of presenting numerical information through Bar Diagrams, Pie Diagram, Pictograms, Cartograms etc. etc. 
(B) FOLLOWING ARE THE ADVANTAGES OF DIAGRAMMATIC PRESENTATION:  
(1) DIAGRAMS ARE ATTRACTIVE AND IMPRESSIVE: 

(2) EASY TO REMEMBER 

(3) DIAGRAMS SAVE TIME 

(4) DIAGRAMS SIMPLIFY DATA 

(5) DIAGRAMS ARE USEFUL IN MAKING COMPARISONS 

(6) MORE INFORMATIVE 

Q.2 DEFINE ‘ONE DIMENSIONAL DIAGRAM’. BRIEFLY EXPLAIN THE TYPES OF ONEDIMENSIONAL DIAGRAM.  
ANSWER:  
(A) ONE DIMENSIONAL DIAGRAM 

(B) FOLLOWING ARE THE TYPES OF ONEDIMENSIONAL DIAGRAM:  
(1) SIMPLE BAR DIAGRAM  Simple Bar diagram comprises of a group of rectangular bars of equal width for each class or category of data. 
(2) MULTIPLE BAR DIAGRAM  This diagram is used when we have to make a comparison between two or more variables like income and expenditure, import and export for different years, marks obtained in different subjects in different classes, etc. 
(3) SUBDIVIDED BAR DIAGRAM  This diagram is constructed by subdividing the bars in the ratio of various components. 
(4) PERCENTAGE BAR DIAGRAM  Subdivided bar diagram presented on a percentage basis is known as Percentage Bar Diagram. 
(5) BROKENSCALE BAR DIAGRAM  This diagram is used when the value of one observation is very high as compared to the others.
In order to gain space for the smaller bars of the series, the largest bars may be broken. The value of each bar is written at the top of the bar. 
(6) DEVIATION BAR DIAGRAM  Deviation bars are used for representing net changes in data like Net Profit, Net Loss, Net Exports, Net Imports, etc. 
Q.3 WHAT KIND OF DIAGRAMS ARE MORE EFFECTIVE IN REPRESENTING THE FOLLOWING?
(A) MONTHLY RAINFALL IN A YEAR. (B) COMPOSITION OF THE POPULATION OF DELHI BY RELIGION. (C) COMPONENTS OF COST IN FACTORY. (NCERT) 

ANSWER:  
(A) MONTHLY RAINFALL IN A YEAR.  Simple Bar Diagram 
(B) COMPOSITION OF THE POPULATION OF DELHI BY RELIGION.  Subdivided Bar Diagram 
(C) COMPONENTS OF COST IN FACTORY.  Pie Diagram or Percentage Bar Diagram. 
Q.4 WHAT DO YOU MEAN BY ‘PIE DIAGRAM’? DISCUSS THE STEPS INVOLVED IN CONSTRUCTING IT.  
ANSWER:  
(A) MEANING OF PIE DIAGRAM 

(B) STEPS INVOLVED IN CONSTRUCTING PIE DIAGRAM 

Q.1 WHY DIAGRAMMATIC PRESENTATION IS BETTER THAN TABULATION OF DATA? 
ANS: It makes data more attractive as compared to tabulation and helps in visual comparison. 
Q.2 WHY MEDIA PERSONS PREFER DIAGRAMMATIC PRESENTATION OF DATA? 
ANS: Because it has ‘eyecatching effect’ and longlasting impact upon its reader/viewers. 
Q.3 WHAT WILL BE THE DEGREE OF AN ANGLE IN THE PIEDIAGRAM, IF A FAMILY SPENDS 50% OF ITS INCOME ON FOOD? 
ANS: (50÷100) X 360 (Or) 50 x 3.6 = 180’ 
Q.4 WHICH BAR DIAGRAM IS USED TO SHOW TWO OR MORE CHARACTERISTICS OF THE DATA? 
ANS: Multiple bar diagram 
Q.5MENTION THE TOTAL OF THE DEGREES OF ALL THE ANGLES FORMED AT THE CENTRE OF A CIRCLE. 
ANS: 360° 
Q.6NAME A BAR DIAGRAM WHERE HEIGHT OF ALL THE BARS IS THE SAME. 
ANS: Percentage Bar Diagram 
Q.7WHICH DIAGRAM CAN BE USED TO DEPICT VARIOUS COMPONENTS OF A VARIABLE? 
ANS: SubDivided Bar Diagram 
Q.8WHAT IS A MULTIPLE BAR DIAGRAM? 
ANS: Multiple Bar diagram is one that shows more than one characteristic of data. 
Q.9WHICH BAR DIAGRAM IS USED TO REPRESENT NET CHANGES IN DATA? 
ANS: Deviation Bar diagram. 
Q.10WHAT IS ANOTHER NAME OF SUBDIVIDED BAR DIAGRAM? 
ANS: Component Bar Diagram. 
The abovementioned concept is for CBSE class 11 Statistics for Economics – Diagrammatic Presentation of Data. For solutions and study materials for class 11 Statistics for Economics, visit BYJU’S or download the app for more information and the best learning experience.