What Is Convenience Sampling?

As its name implies convenience sampling refers to the collection of information from members of the population who are conveniently available to provide it. One would expect that the Pepsi Challenge contest was administered on a convenience sampling basis. Such a contest with the purpose of determining whether people prefer one product to another might be held at a shopping mall whether people prefer one product to another might be held at a shopping mall visited by many shoppers. Those inclined to take the test might from the sample for the study of how many people prefer Pepsi over Coke or product X to product Y. such a sample is convenience sample.

Consider another example. A convenience sample of five officers who attended the competitor's showcase demonstration at the country fair the previous evening offered the vice president of the company information on the new products some ideas on the next steps to be taken by the company. Convenience sampling is most often used during the exploratory phase of a research project and is perhaps the best way of getting some basic information quickly and efficiently.  Instead of obtaining information from those who are most readily or conveniently available, it might sometimes become necessary to obtain information from specific target group.

Give me an example of convenience sampling from 9,10, 11, 12 graders at one school