Eligibility Criteria are specified characteristics that potential participants must possess in order to be involved in a particular research project. Empty Nesters are those people whose children have left or are about to leave the family home. Enabling Techniques see projective techniques. End Piling is a phenomenon where many survey responses fall into just a few categories at the end of a measurement scale. EPOS Data is electronic point of sale data and it measures sales of products as they are being paid for by consumers.
Error see total error.
Executive Summary is a document that summarises all the sections of a market research report. Experience Survey is a survey involving participants who have knowledge of a particular situation. Experiment is the process of manipulating one or more independent variables and measuring their effect on one or more dependent variables, while controlling for external variables. Experimental Error is the error caused by the conditions of the experiment itself and it creates uncertainty that the observed effects may not be due to the manipulation of the independent variable. Experimental Treatments are the different conditions created by manipulating the independent variable.