Survey Sampling is important to have a group of people who will participate in the survey and be able to represent the whole target population. This group is called a “sample”. Determining the right kind and number of participants in a sample group, also known as sampling, is one of the basic steps in conducting surveys. In survey sampling it most often involves a questionnaire used to measure the characteristics and/or attitudes of people. Different ways of contacting members of a sample once they have been selected is the subject of survey data collection. In a probability sample each member of the target population has a known and non-zero probability of inclusion in the sample.