Example- Let us say there are 200 participants in a conference and we would like to select 50 participants by simple random sampling. The list of all the 200 participants would be available which constitutes the sampling frame. The 50 participants can now be selected by either using random number table or by lottery method. Once a participant has been selected, that particular number is struck off from the random number table. This method is known as sampling without replacement. In this way 50 participants are selected.