Class 11 Economics - ISC
Collection and Organisation of Data
The chapter 'Collection and Organisation of Data' in Class 11 ISC Economics introduces students to the fundamental initial stages of statistical investigation. It covers the sources of data collection—primary and secondary—along with various sampling and non-sampling methods. Furthermore, it explains how raw data is systematically processed, classified, and tabulated to make it meaningful for economic analysis. Mastering this chapter is crucial for board exams as it forms the foundational numerical and theoretical basis for subsequent statistical chapters like presentation and analysis of data.
Start Learning FreeKey Concepts
Primary Data
Original data collected firsthand by the investigator for a specific research purpose through surveys, interviews, or observations.
Secondary Data
Data that has already been collected, processed, and published by someone else, such as government reports, journals, or websites.
Sampling Techniques
Methods of selecting a representative subset of a population, including random, stratified, systematic, and quota sampling.
Classification of Data
The process of arranging raw data into homogeneous groups or classes according to common characteristics such as geography, chronology, or attributes.
Tabulation
The systematic logical arrangement of classified data in rows and columns to facilitate comparison and highlight statistical findings.
Important Formulas
Board Exam Info
In the ISC Class 11 Economics examination, statistics chapters collectively carry significant weightage (around 20-25 marks). This specific chapter typically contributes 4 to 6 marks, featuring direct short-answer questions, differentiation between primary and secondary data, or numerical problems on range and class intervals.
Frequently Asked Questions
What is the main difference between primary and secondary data?
Primary data is collected firsthand for the first time by the investigator, making it more specific but expensive. Secondary data is already collected by someone else, making it economical but potentially less tailored to current needs.
When should we use census method instead of sampling?
The census method is ideal when the population size is small, high accuracy is required, or units of the population have diverse characteristics.
How do exclusive and inclusive series differ in classification?
In an exclusive series, the upper limit of one class is the lower limit of the next (e.g., 10-20, 20-30). In an inclusive series, both limits are included in the class (e.g., 10-19, 20-29).
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