how should I carry out each of these studies to review if there is a link between happiness and income? survey etc? also, what participants would I use? and what information should I collect? what measure of association can be obtained from each design?

a) Cross-sectional study: b) Case Control study: c) Prospective Cohort study: d) Retrospective Cohort study. e) Quasi-experimental study. f) Randomized Controlled Trial