cher will need to select people from all these four stages and a manager.
. Confirming and disconfirming case sampling is usually done to check the validity of the previous study. It can be done in two ways: either to select cases which will confirm the previous study or find good candidates for opposite outcomes, ie disconfirm it.
. Purposeful random sampling. The idea of ​​random sampling in qualitative research is different from the same in quantitative. The idea in qualitative study is not to generalize to the whole population, but again to show that the theory s idea is not wrong or biased.
. Sampling politically important cases can be used for the researcher s purposes or funding agencies.
. Convenience sampling is usually used because of the availability of the cases. However this sample in better to be avoided, because it not very purposeful in comparison to the above discussed.
. Opportunistic sample is described by Patton as a different one. The idea of ​​this sample is that the selection of participants is based on the previous studied. This way is very important in qualitative studies, because it helps to avoid collecting useless data. This sample is more flexible in comparison to the earlier described, because once a researcher decided whom he or she will involve in the extreme, purposeful random, critical or other sample, it is not recommended to change them, that is why opportunistic sample gives a researcher more chances to find interesting cases.sometimes in qualitative or quantitative study a researcher can face a problem that not so many people wish to be involved in the project. And they can give many reasons for this, such as lack of time, do not want to do something according to instructions, do not like the idea of ​​the research or some other reasons. In this case a researcher can come to a conclusion that volunteers are needed. But it is always worth remembering that sometimes if volunteers are not old enough or because of other reasons, the researcher will need to get permission from parents or caretakers. And even if the volunteers are old enough they have to be informed about the study. Usually it can be done by putting a notice describing the idea of ​​the research and also place and time of data collection process.
research study explanation
Tests in the educational research
Test can be one of the ways for data collection. In order to choose a good test, a researcher should remember that it hat to respond six main criteria:
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