What kind of diagrams are more effective in representing the following?
Monthly rainfall in a year
Simple Bar Diagram is more effective for representing monthly rainfall in a year as it shows a single characteristic (rainfall) at different points of time (months). Bar diagrams are suitable for non-frequency type data where values of characteristics at various points of time are noted.
Composition of the population of Delhi by religion
Pie Diagram is more effective for representing the composition of the population of Delhi by religion as it shows different component parts (religious groups) as parts of a whole (total population). Pie diagrams effectively display proportions and percentages.
Components of cost in a factory
Component Bar Diagram is more effective for representing components of cost in a factory. Component bar diagrams are useful in comparing the sizes of different component parts and showing the relationship among these integral parts, such as expenditure patterns with components like food, rent, medicine, etc.
Explanation
The textbook explains that different types of data require different modes of diagrammatic representation. Simple bar diagrams are suitable for non-frequency data showing characteristics at various points of time. Pie diagrams fall under geometric diagrams and are effective for showing composition/parts of a whole. Component bar diagrams are specifically mentioned as useful for comparing sizes of different component parts like expenditure patterns, budget outlays, and similar data where parts make up a whole.