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1 CHAPTER 1 SCOPE OF THE STUDY 1.1 INTRODUCTION ...

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There are four main types of Probability Samples (Department of Marketing, 2005,p.156-162):• A Simple Random Sampling which is obtained by choosing elementary units, in sucha way that each unit in the population has an equal chance of being selected. Thesimple random sample is free from bias;• A systematic random sample which is obtained by selecting one unit on a randombasis and choosing elementary units at evenly spaced intervals until the desirednumber of units is obtained;• A stratified sample is obtained by independently selecting a simple random samplefrom each population stratum; and• A cluster sample is obtained by selecting clusters from the population on the basis ofsimple random sampling.There are three primary main kinds of Non-Probability Samples (Department ofMarketing, 2005, p.156-162):• The convenient sample resulting when the more convenient elementary units arechosen from a population for observation;• The judgment sample, which is obtained according to the discretion of someone whois familiar with the relevant characteristics of the population;and• The quota sample, which allows a specific number of respondents to be chosen, whopossess certain characteristics, known or presumed to affect the subject of theresearch study.a) The SampleSampling is the act, process or technique of selecting a suitable sample. The judgementsample is obtained according to the discretion of someone who is familiar with therelevant characteristics of the population. The purpose of the sample is to drawconclusions about the population’s characteristics by directly observing only a sample ofthe population (Mugo, 2008).6

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