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qtc9-1

N.P.Bali; P.N.Gupta; Dr C.P.Gandhi Laxmi Publications PDF

Unit-II

Sampling and Sampling Distribution

9

Concepts of Sampling

9.1. INTRODUCTION

We are well familiar with secondary data i.e., the data which are obtained either from published or unpublished sources. But, sometimes, secondary data are not available for the problem under consideration. In such situation, a decision may be taken to collect primary data by using various methods like �Direct Personal Interviews�, �Indirect Oral Interviews�,

�Information From Correspondents�, �Mailed Questionnaire Method� etc. But there are some limitations in applying these methods. The required information may be obtained from the following discussed methods viz., �Census Method� and �Sample Method�.

9.2. CENSUS METHOD

This method is also known as �Complete Enumeration Survey Method�. In this method, data are collected from each and every unit of the population. As an example, if we wish to calculate the average wages of all the workers working in a coal company, we would obtain the total wages of all the workers and then divide the total wages by the number of workers working in the coal company.

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