NCERT Book Class 11 Economics (Statistics for Economics) Chapter 2 Collection of Data

C HA P T E R

2 Collection of Data

chapter, you will study the sources of
Studying this chapter should
data and the mode of data collection.
enable you to:
• understand the meaning and The purpose of collection of data is to
purpose of data collection; show evidence for reaching a sound and
• distinguish between primary and clear solution to a problem.
secondary sources; In economics, you often come
• know the mode of collection of data; across a statement like this,
• distinguish between Census and “After many fluctuations the output
Sample Surveys;
of food grains rose to 132 million tonnes
• be familiar with the techniques of
sampling; in 1978-79 from 108 million tonnes in
• know about some important sources 1970-71, but fell to 108 million tonnes
of secondary data. in 1979-80. Production of food grains
then rose continuously to 252 million
tonnes in 2015-16 and touched 272
1. INTRODUCTION
million tonnes in 2016–17.”
In the previous chapter, you have read In this statement, you can observe
about what is economics. You also that the food grains production in
studied about the role and importance different years does not remain the
of statistics in economics. In this same. It varies from year to year and