1. Vocabulary 2 from validity to reliability, and from factors to regression

2. the relations between valid : up-to-date, true; well-grounded, sound, cogent = powerful, constraining, convincing; sufficient, and effective and reliable : true, more true, refered to something, a trustworthy source;

3. Ethics ! ethic (n): a moral principle or a set of principles ethical (a): dealing with moral questions or theory ethics (n, pl): the science of morals; a system of principles… (Source: The Cassell Concise Dictionary)

4. data manipulations 1 factor : a changing value with an affect on a phenomenon; any circumstance, fact or influence which contributes to a result factor analysis : A class of procedures primarily used for data reduction and summarization.

5. data manipulations 2 regression : a backward movement, a return, reversion to type regression analysis : A statistical procedure for analyzing associative relations between a metric-dependent variable and one or more independent variables.