A random number is then selected between 1 and 10 (e.g., a 3 is selected). The 3rd unit would then be selected for the sample. Using the sampling fraction, 10 units would be skipped and the 13th unit would be included. Skipping ahead 10 more units, the 23rd unit would be included. This procedure would continue until 10 units were selected for the sample and the desired sample size reached.