It is where they survey is pretty much already for you
Example: Mrs. Wolfe's 5th grade class is given the survey
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convenience sampling consists of two or more sample events.
No. Convenience sampling involves the active participation of the researcher. It's called convenience sampling because the researcher simply grabs whomever happens to be close to hand. It's not whether people volunteer themselves. Please see the link.
random sampling ,systematic sampling , self-selected , and there is one more i don't know
Convenience sampling refers to sample being drawn from a population that is readily available and close to hand. For example, the sample may involve finding someone through a phone or an interview at a shopping center.
Convenience sampling is also know as grab sampling. There is no procedure for the sampling itself because the emphasis at this stage is usually on improving other aspects of the research such as exposing flaws in a survey form or training personnel. In grab sampling you simply take any sample element that you can find although you might favour those that would exercise parts of your system that might seem weak. For instance, if your survey instrument asks for ages and some people were reluctant to provide them, then how would this be resolved once the grab sampling phase had been completed and actual sampling had started?