Soran Rajabi

The research population is presented from all undergraduate students of the Persian Gulf University. Select the statistical population of this research to select a sample of this research if two thousand people choose you among the universities of medical sciences, which according to Krejcie table And Morgan will be selected by multi-stage video cluster sampling. In this research, which has been done using the same method of multi-stage cluster sampling, in the Persian Gulf University, four faculties of literature in humanities, engineering, petrochemicals and campus have been selected from among the existing students, and then in each faculty with Using the method of random selection of several classes and each class with the same method of random selection of several students and was distributed by distributing a questionnaire between them in a certain period of time for about 30 to 35 minutes. It should be noted that it performs exactly a few steps of sampling the cluster, given that it performs more sampling of the cluster, because the sample units are selected in several stages from the community level and change the desired variable in the sample. Can introduce be in the community.