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If several hundreds, a minimum of 20% is acceptable; if few thousands, a minimum of
10% is acceptable and if several thousands, 5% will do. The population in this case can
be classified as several hundreds but because the research
is purposive in nature,
stratified sampling was also used, thus the use of 10% of the population as sample size.
In this case study, the semi-structured interviews were conducted face-to-face with 10
top management officials of the Company. The
one hundred and fifty five
questionnaires were administered purposively to the remaining three categories of staff
– engineers, technicians and support.
The sample size of 155 was representative considering the extent of variability in the
population, time constraints and framework within which the study was to be completed
and submitted and also the confidence in the inference made.
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