the main objective in sampling is to select a sample from a population in order to estimate some unknown population parameter, usually a total or a mean of some interesting variable. a simple way to take a sample of size n is to let all the possible samples have the same probability of being selected. this is called simple random sampling and then all units have the same probability of being ch...

Purpose: The main purpose of this article is conceptual modeling of market efficiency of information databases, there are 3 main questions in this article: 1) what are the components of the efficient market? 2) Is the database markets an efficient market? 3)  How is the mental model of the efficient market databases? Methodology:  In order to achieve that, summarizing content analysis technique...