Collection of Data
How does the government know prices, harvests and jobs across a vast country. This topic in NCERT Statistics for Economics for Class 11 explains collection of data through primary and secondary sources, census and sample surveys, random and purposive sampling, and tools like questionnaires and interviews. It discusses pilot surveys, errors, and the roles of agencies that publish official data. You will learn to choose a suitable method, design simple schedules and to judge reliability before any table or diagram is made.
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