Tolong jelaskan mengenai Ukuran sampel dari Sampling (statistika) dalam bahasa sunda

Where the frame and population are identical, statistical théory yields exact recommendations on sample size. However, where it is not straightforward to define a frame representative of the population, it is more important to understand the cause system of which the population are outcomes and to ensure that all sources of variation are embraced in the frame. Large number of observations are of no value if major sources of variation are neglected in the study.