Question

Explain the different ways of choosing a sample.

A convenience sample is a group of subjects who are easy to get: students who walk through the union, people at a shopping mall, workers in your own unit. Convenience samples are useful for a rough pretest of a questionnaire and may be acceptable for some class research projects. However, you cannot generalize from a convenience sample to a larger group.
A purposive or judgment sample is a group of people whose views seem useful. Someone interested in surveying the kinds of writing done on campus might ask each department for the name of a faculty member who cared about writing, and then send surveys to those people.

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