The effect of statistical sampling error on reliability and validity.
The essential purpose of sampling is to select a proportion, a sample, of the members of a group, a statistical population, and to do so in such a way that any data obtained from the sample can be used to describe the statistical population in a meaningful way. A description of a statistical population is needed when it has become necessary to resolve a problem that affects that population. It shows the severity of the problem, the extent of the problem, and the effectiveness of the action taken to resolve the problem. The statistical population is described by first describing the sample, and then converting this description into a description of the statistical population.
Applied Statics for Health and Community Studies, School of Computing and Management Sciences, Sheffield Hallam University.
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le Roux