Imagine that a researcher wants to understand more about the career goals of students at a particular university. Let?s say that the university has roughly 10,000 students. These 10,000 students are our population ( N ). Each of the 10,000 students is known as a unit. In order to select a sample ( n ) of students from this population of 10,000 students, we could choose to use self-selection sampling. Let's imagine that because we have a small budget and limited time, we choose a sample size of 100 students. However, it is important to the sampling strategy that each of the students is in their final year of university. Therefore, you would need to ensure that only final year students took part in the research. To publicise this, the study could run an advertisement on student radio, the student newspaper, or on physical and online notice boards accessed by students at the university.