The uploaded PDF contains a comprehensive worksheet based on Chapter 2, Collection of Data, from Class 11 Economics. This worksheet focuses on one of the most practical areas of statistics, which is how data is collected, classified, and used for economic analysis. It covers primary and secondary data, their sources, methods of collection, advantages and limitations, and the precautions required while using data. The worksheet includes multiple-choice questions, assertion–reason questions, case-based questions, and descriptive answers.
I am writing about this worksheet because understanding how data is collected is essential before moving ahead to tabulation, presentation, and analysis of data. Many students memorise definitions but struggle to apply them in real situations. A worksheet like this helps bridge that gap by presenting real-life examples and application-based questions that strengthen conceptual clarity.
As seen in the uploaded worksheet PDF CH-2 Collection of data WS 1 QU…, the questions are arranged in different sections to test knowledge, understanding, and application.
Overview of the Worksheet Structure
The worksheet is divided into several sections that gradually move from objective questions to descriptive answers.
It includes:
• Section A – Multiple-choice questions
• Section B – Short answer questions
• Section C and D – Case-based and descriptive questions
• Section E and F – Application-based MCQs and long answers
This structure follows the CBSE examination pattern.
Meaning of Data and Collection of Data
The worksheet begins with questions related to what data is and why it is collected.
Key ideas include:
• Data refers to numerical facts collected for a specific purpose
• Collection of data means gathering information from various sources
• Data can be collected either from the source of origin or from existing records
These basic ideas are tested through MCQs and short answers.
Primary Data
A major part of the worksheet focuses on primary data.
Primary data refers to data originally collected by the investigator for the first time.
Important points covered:
• It provides first-hand information
• It is more reliable and specific
• It is costly and time-consuming
• It is collected for a particular purpose
Examples in the worksheet include collecting information about pocket allowances, family income, or socio-economic status of students.
Methods of Collecting Primary Data
The worksheet lists different methods such as:
• Personal investigation
• Mailing questionnaire
• Telephone interview
• Schedule method
Students are asked to identify suitable situations for each method.
Download this CH-2 Collection of data WS 1 QUESTIONS PDF File: Click Here
Secondary Data
Secondary data refers to data already collected by someone else and used by the investigator.
Important features include:
• It provides second-hand information
• It is less costly and saves time
• It may not exactly suit the investigator’s purpose
The worksheet highlights that secondary data may be published or unpublished.
Sources of Secondary Data
The worksheet mentions several sources:
• Government publications
• Semi-government publications
• Publications of research institutions
• International publications
• Websites and journals
Examples include census reports, economic surveys, and reports of committees.
Published and Unpublished Data
Students learn that:
• Published data appears in books, journals, reports, and websites
• Unpublished data includes office records, research notes, and internal documents
Case-based questions explain grey literature and its role in research.
Difference Between Primary and Secondary Data
Several questions test the differences.
Primary Data:
• Original
• Costly
• Time-consuming
• Specific to purpose
Secondary Data:
• Already available
• Economical
• Time-saving
• Less specific
These differences are important for exams.
Precautions While Using Secondary Data
The worksheet emphasises that an investigator must:
• Check reliability of source
• Ensure data is relevant
• Verify accuracy
• Understand definitions and methods used
This prevents misuse of data.
Why This Worksheet Is Useful
From my experience, this worksheet is highly useful because:
• It explains concepts with real-life examples
• It improves application skills
• It prepares students for board-style questions
• It strengthens understanding of statistics
Regular practice with such worksheets builds confidence.
How to Use This Worksheet Effectively
• Read the NCERT chapter carefully
• Revise definitions
• Solve MCQs first
• Attempt descriptive questions next
• Analyse mistakes and revise weak areas
