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sample survey is a method of drawing an inference about the characteristics of a population
or universe by observing a part of the population. For example, when one has to make an
inference about a large lot and is not practicable to examine each individual member of the
lot, one always takes help of sample surveys, that is to say one examines only a few member
of the lot and, on the basis of this sample information, one makes decisions about the whole
lot. Thus, a person wanting to purchase a basket of oranges may examine a few oranges from
the basket and on that basis make his decision about the whole bas
