MARK205 Lecture Notes - Lecture 7: Nonprobability Sampling, Simple Random Sample, Sampling Error
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Sample: on the other hand, is a subgroup of the population selected for participation in the study. Sample frame: a master source of sample units in the population. Consists of a list or set of directions for identifying the target population, for example: telephone book, directory listing firms in specific industries (e. g. manufacturing and services, mailing list acquired from a professional research company (e. g. incnet business. If: cost and time permit, population size is quite small (e. g. industrial products, variance or variability in characteristics of interest is large, costs of making an incorrect decision or sampling errors are high. If census is impossible, sampling is the only alternative (e. g. consumer response from all over the world to a new advertising them for coca cola) Simple random sampling: the probability of being selected into the sample is known and equal for all members of the population.
