What are your thoughts??

When a study is to be conducted on a target population, it may be impossible to reach the entire group for observation and data collection. Hence the theory of sampling comes into effect where the various techniques can be applied to select a representative size (sample) from the entire population. For example if a study is to be conducted on the residents of Omaha, Nebraska, it will be convenient and feasible to select a sample from the entire population for the study.