EXAMPLE
If the population contains 8.200 items and a sample of 50 is required, every 164th item is selected (8.200 50). After a random start in the first interval (1 to 104), every additional 164th item is selected. For example, if the 35th item is the first selected randomly, the next is the 199th (35+164). The third item is the 363rd (199 + 164). The process is continued until the 50 items are identified.