Random sampling is a statistical technique used in selecting people or items for research. There are many techniques that can be used. Each technique makes sure that each person or item considered for the research has an equal opportunity to be chosen as part of the group to be studied.
The GRE, or Graduate Record Exam, is a pre-requisite for graduate school applicants. GRE scores measure your abilities as a student and reflect your educational background. Although it is not necessarily a valid gauge to determine your academic success in graduate school, the GRE is still an important assessment tool to evaluate your analytical and quantitative skills, verbal communication skills and vocabulary.