Answer:
The 1500 residents who were identified in the study are known as the study participants or the study sample. These individuals were selected to be part of the study based on certain criteria or characteristics, and they represent a smaller group of people from a larger population.
In research studies, it is often not feasible or practical to collect data from an entire population. Therefore, researchers select a sample, which is a subset of the population, to study and make inferences about the larger population.
For example, let's say a study is conducted to examine the effects of a new medication on a certain medical condition. The researchers may identify 1500 individuals who meet the criteria for the study, such as having the specific medical condition and being within a certain age range. These individuals would be considered the study participants or the study sample.
It is important to note that the findings from the study are based on the data collected from these study participants and may not be directly applicable to the entire population. However, if the study is well-designed and the sample is representative of the population, the findings can still provide valuable insights and information.