<prompt> Collection of information from the representative units in the sample is known as:CensusSamplingCountingAll of the above  <response>: Census is the collection of information from all individuals in a population.Sampling is the process or technique of selecting a sample of appropriate characteristics and adequate size.Advantages of samplingIt reduces the cost of the investigation, the time required and the number of personnel involved.It allows a thorough investigation of the units of observation.A sample can be covered more adequately and in more depth than can a total population.Reference: Essentials of Preventive and Community Dentistry, Soben Peter, 4th ed page no 288 