<prompt> What is the method of sampling in which the units are picked up at regular intervals from the universe?Simple random samplingSystematic random samplingStratified random samplingSnow ball sampling  <response>: Systematic sampling is a type of probability sampling method in which sample members from a larger population are selected according to a random staing point but with a fixed, periodic interval. Ref: 25th edition, Parks Textbook of Preventive and Social Medicine, Page no. 913 