Class 11 Statistics NCERT Solutions for Chapter 2 Collection of Data: Free PDF Download
CBSE Class 11 students can now access the NCERT Solutions for Statistics Chapter 2 Collection of Data for free. Each question in the NCERT Class 11 Statistics Chapter 2 comes with a thorough and step-by-step answer, as well as illustrations and explanations (wherever applicable) to help students understand the concepts and solve the problems. Top subject-matter experts at Vedantu’s created NCERT Solutions for Statistics Chapter 2 Collection of Data, who aim to provide comprehensive and precise explanations of the topics covered in the chapter through solved textbook question answers. Students can download the solutions through the pdf link provided below.
Table of Content
Topics Covered in Class 11 Statistics Chapter 2
Below are the key topics covered in the Class 11 Statistics Chapter 2.
Meaning and purpose of data collection
What are the different sources of data?
How do we collect data?
Census and Sample Surveys
Sampling and Non-Sampling Errors
Census of India and NSSO
FAQs on NCERT Solutions for Class 11 Statistics Chapter 2 Collection of Data
1. What is the correct step-by-step procedure for collecting primary data as per the NCERT Solutions for Class 11 Statistics Chapter 2?
To collect primary data, the steps recommended include:
- Clearly defining the objective of the data collection
- Selecting the population or universe
- Determining the method of data collection, such as personal interviews, mail questionnaires, or telephonic interviews
- Designing a suitable questionnaire
- Conducting a pilot survey to test the methodology
- Collecting data systematically from respondents
- Verifying and organizing the collected data for analysis
2. How do NCERT Solutions for Class 11 Statistics Chapter 2 distinguish between primary data and secondary data?
Primary data is information gathered directly by the investigator for the first time, often through surveys, experiments, or direct observation. In contrast, secondary data has already been collected, processed, and published by someone else, and is sourced from books, reports, or records. The distinction is important for choosing the most reliable source for statistical analysis.
3. What are the key advantages and disadvantages of using census and sample survey methods as described in the Class 11 Statistics NCERT Solutions?
The census method involves collecting data from every unit in a population, offering complete coverage but being time-consuming and expensive. The sample survey method collects data from only a part of the population, making it quicker and more economical, but potentially less comprehensive. The NCERT Solutions highlight these points to help students select the appropriate method for different statistical studies.
4. According to CBSE 2025–26 guidelines, what are the sources of secondary data discussed in Chapter 2?
Chapter 2 outlines two major sources of secondary data:
- Published sources: Government publications, reports of committees and commissions, international organizations, journals, books, and newspapers.
- Unpublished sources: Internal records of organizations, personal diaries, and records maintained by private companies or individuals.
5. How can a well-constructed questionnaire improve the accuracy of data collection in Statistics, based on the NCERT Solutions approach?
A well-constructed questionnaire ensures clarity, avoids ambiguity, maintains a logical sequence, asks only relevant questions, and steers clear of biased or leading queries. Careful preparation following these guidelines increases the reliability, objectivity, and usefulness of the collected statistical data.
6. What are sampling and non-sampling errors, and how does NCERT Solutions recommend minimizing them?
Sampling errors arise because only part of the population is studied rather than the whole, potentially missing out on certain characteristics. Non-sampling errors can occur at any stage—questionnaire design, data collection, data processing, or respondent non-response. These can be minimized by precise planning, accurate tool design, clear instructions, and diligent data handling, as advised in the NCERT Solutions for Class 11 Statistics Chapter 2.
7. What is the importance of a pilot survey in statistical investigations, as highlighted in the Class 11 NCERT Solutions?
A pilot survey is a preliminary test conducted with a small group before the main survey. It helps identify potential issues in the questionnaire, refine data collection procedures, and improve overall study design, leading to more reliable and accurate results in the actual survey.
8. Why is understanding the difference between random and non-random sampling methods crucial for students of Class 11 Statistics?
Random sampling gives every unit an equal chance of selection, reducing selection bias and ensuring representativeness of the population. Non-random sampling may introduce biases that can distort statistical conclusions. The NCERT Solutions emphasize this distinction so students can select and justify appropriate sampling methods for various research scenarios.
9. How does the concept of 'population' differ from 'sample' in the context of NCERT Solutions for Chapter 2?
'Population' in Statistics refers to the entire set of items, individuals, or data points about which information is needed. A 'sample' is a subset selected from this population for analysis. The population provides a full view, while the sample offers a practical way to make inferences when studying the whole is not feasible.
10. What steps can students take, following NCERT Solutions, to ensure their data collection process leads to accurate statistical analysis?
Students should:
- Define objectives clearly
- Choose an appropriate method of data collection
- Develop and test a proper questionnaire
- Use unbiased sampling techniques
- Conduct a pilot survey
- Ensure careful data recording and processing
11. How do errors arise during the data acquisition process, and what impact do they have on statistical studies according to Class 11 NCERT Solutions?
Errors may result from faulty tool/questionnaire design, ambiguous questions, data entry mistakes, or non-response by participants. These errors can bias statistical results and lead to incorrect conclusions. Both sampling and non-sampling errors must be minimized for accurate data-driven decision making.
12. Why is it important for students to follow the step-wise method suggested in NCERT Solutions when solving textbook problems in Chapter 2?
Following a step-wise approach ensures methodical problem-solving, reduces the risk of missing key points, and aligns answers with CBSE marking schemes. This practice not only increases accuracy but also helps build systematic thinking skills essential for CBSE board exams and future studies in statistics.
13. What are common misconceptions students must avoid when identifying sources of data as per NCERT Solutions for Class 11 Statistics Chapter 2?
Students often confuse primary and secondary data, sometimes assuming all online data is primary or that official reports are always unbiased. It's essential to verify the source's nature and credibility, as primary data comes directly from original investigation while secondary data is already published or recorded by others.
14. How can understanding data collection methods help students apply statistics in real-life scenarios?
Knowledge of data collection methods empowers students to plan effective surveys, evaluate real-world datasets, and critically assess the reliability of reports in fields like economics, social sciences, public policy, and business. Applying these methods ensures informed decisions and enhances practical problem-solving skills beyond academics.
15. How are the NCERT Solutions for Statistics Chapter 2 tailored to the CBSE 2025–26 exam pattern and syllabus?
NCERT Solutions for Class 11 Statistics Chapter 2 follow CBSE 2025–26 guidelines by providing step-by-step explanations for each exercise, addressing both conceptual clarity and board exam requirements. Solutions are prepared by subject matter experts and are available in both English and Hindi, ensuring comprehensive preparation for students.
