5. Time-consuming to contact the whole population
In instances where population has more than 1000 objects, to interview every member
would take a considerable amount of time if the researcher
were undertaking the task
alone.
The sampling cycle
Three specific sub-components are relevant:
• The invited sample
•
The accepting sample
• The data-producing sample.
The invited sample is all components of the populace chosen to form the sample and invited
to participate in the study. The section of the sample that acknowledges the invitation to
participate in the study is called the accepting sample. The data-producing sample is the
actual portion of the sample that provides information for the study.
Representatives
Applying the findings and generalisation of a study to the population and the universe is
only permissible when the sample can be considered a representative of the population.
Hence, in the sampling process, the researcher must be:
• Guided by the recurring requirement to ensure representation.
• It is important for the researcher to face the critical issue of determining whether the
actual number of respondents constitute an adequate percentage of the sample for
the findings to be representative of the study population.
KINDS OF SAMPLING
The two extensive categories of sampling designs are probability
sampling and non-
probability sampling.
Probability sampling
is based on the concept of random selection
– a selection procedure
that ensures that each element of the population is given a known chance of selection.
Non-probability sampling
is
non-random, purposive and subjective because the
researcher may select the sample using criteria other than those associated with
randomness of selection.
Mind map 4.2 below lists all the features of probability and non-probability sampling
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