PSY 250 Lecture Notes - Lecture 13: Dependent And Independent Variables, Confounding
Document Summary
Makes sure every participant within each condition gets exactly the same experience. Experimental studies are highly scripted for this reason. Each participant has an equal chance of being assigned to a particular level of the iv. On average, the two groups will be the same on extraneous variables. Doesn"t always work out, but the more people you have, the better the chances are. Measure the extraneous variable and then assign people to groups based on that measurement. Not possible to do it for every possible extraneous variable. Testing the same person in all of your conditions. However, repeated testing creates its own set of problems. Looks like an experimental variable but cannot be randomly assigned. Cannot be interpreted as causing changes in the dv or outcome variable. Showing that variation in the dv is caused only by variation in the. Showing that the relation between the iv and dv isn"t due to a confounding variable.
