Population: The population refers to the entire group of subjects that we are interested in studying. It includes all possible individuals or objects that share certain characteristics.
Sample: A sample is a subset of the population that is selected for observation or study. It represents a smaller group from which we gather data to make inferences about the larger population.
Sampling Frame: A sampling frame is a list or representation of all the subjects in the population from which a sample will be drawn. It serves as a reference for selecting individuals to be included in the study.