The purpose of this is to determine which sample size, confidence interval, and confidence level are adequate for our studies.

The purpose of this is to determine which sample size, confidence interval, and confidence level are adequate for our studies. the population is sometimes too large that a regular sampling methodology would be infeasible; as there is a time constraint! the paper has to discuss time and cost. in addition, we need to sample different things. for example: the time it takes to complete a task, number of tasks, number of letters received and so on.