Sure, I can help you with that.
One non-probability sampling technique that you might use to obtain a sample for this study is **convenience sampling**. Convenience sampling involves selecting participants who are easily accessible to the researcher. In this case, you could select middle school students who are attending a particular school or who are members of a particular club or organization.
To draw your sample using convenience sampling, you could start by identifying a list of middle schools in your area. Then, you could contact the principals of those schools and ask for permission to survey students. Once you have permission, you could randomly select a group of students from each school and survey them.
You might select convenience sampling over other non-probability sampling techniques because it is relatively easy and inexpensive to implement. Additionally, convenience sampling can be a good way to obtain a sample of participants who are willing to participate in your study.
However, it is important to note that convenience sampling can be biased. This is because the participants in your sample may not be representative of the population of all middle school students. For example, if you only survey students who are attending a particular school, your sample may be biased towards students from that particular school.
To reduce the bias of convenience sampling, you can try to select participants from a variety of different schools and backgrounds. Additionally, you can use a technique called **purposive sampling** to select participants who are likely to have the information that you are looking for. For example, if you are interested in studying the causes of bullying, you could purposively select students who have been bullied or who have witnessed bullying.
By using a combination of convenience sampling and purposive sampling, you can reduce the bias of your sample and increase the likelihood that your results will be representative of the population of all middle school students.