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# Sample Design and Determination of Sample Size in Social Science Research Sample design is a systematic process through which a researcher selects a smaller group of individuals, households, institutions, or other units from a larger population for the purpose of collecting data and drawing conclusions about the population as a whole. In social science research, it is generally impractical to study every member of a population because of limitations of time, money, manpower, and accessibility. A carefully designed sample therefore enables the researcher to obtain reliable and valid information from a manageable number of respondents. In Development Studies, sample design is particularly important because research often deals with diverse populations differentiated by income, gender, caste, ethnicity, occupation, location, education, and access to development programmes. The first step in sample design is to clearly define the research population. The population refers to the complete set of units about which the researcher wants to make generalisations. For example, if a study examines the impact of a rural employment programme, the population may consist of all households eligible for or participating in the programme in a particular district. The population must be defined in terms of geographical area, demographic characteristics, time period, and other relevant features. A clearly defined population prevents ambiguity regarding who should be included in the research. The next step is to identify the sampling unit. A sampling unit is the basic element selected during the sampling process. It may be an individual, household, village, school, organisation, firm, community, or institution. The choice of sampling unit depends upon the research objectives and the nature of the population. For instance, a study of household poverty may use households as sampling units, whereas research on women's political participation may use individual women as the sampling units. The researcher must then develop or identify a sampling frame. A sampling frame is a list or other representation of all units belonging to the target population from which the sample can be selected. Examples include electoral rolls, census lists, household registers, school registers, or administrative records. An accurate and up-to-date sampling frame improves the representativeness of the sample. If certain sections of the population are missing from the frame, sampling bias may occur. The fourth stage involves selecting an appropriate sampling method. Sampling techniques are broadly classified into probability and non-probability sampling. _________ _________ ________ ______ __________ ________ ____ ___.
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