Discuss the uses of nonprobability and probability sampling
What will be an ideal response?
Nonprobability sampling is used in concept tests, package tests, name tests, and copy tests, where projections to the populations are usually not needed. In such studies, interest centers on the proportion of the sample that gives various responses or expresses various attitudes. Samples for these studies can be drawn using methods such as mall intercept quota sampling. On the other hand, probability sampling is used when there is a need for highly accurate estimates of market share or sales volume for the entire market. National market tracking studies, which provide information on product category and brand usage rates, as well as psychographic and demographic profiles of users, use probability sampling. Studies that use probability sampling generally employ telephone interviews. Stratified and systematic sampling are combined with some form of random-digit dialing to select the respondents.
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