PS295 Chapter Notes - Chapter 9: Random Assignment, Repeated Measures Design, Latin Square
2) Assignment:
2) the researcher must have the power to assign participants to the various experimental
conditions in a way that ensures their initial equivalence
-participants who receive a nonzero level of the IV compose the experimental groups
-control groups receive a zero level of the IV
Pilot tests:
-tests to ensure levels of IV are different enough to be detected by participants
Manipulation check:
-a question or set of questions designed to determine whether the IV was manipulated
successfully
-ex asking participants to rate brightness of lighting in experiment (if participants in diff
groups rate it differently, we know difference in brightness was perceptible)
Participant variables:
-existing characteristics of the participants
Simple random assignment:
-every participant has equal probability of being placed in any experimental condition
Document Summary
Assignment, the researcher must have the power to assign participants to the various experimental conditions in a way that ensures their initial equivalence. Participants who receive a nonzero level of the iv compose the experimental groups. Control groups receive a zero level of the iv. Tests to ensure levels of iv are different enough to be detected by participants. A question or set of questions designed to determine whether the iv was manipulated successfully. Ex asking participants to rate brightness of lighting in experiment (if participants in diff groups rate it differently, we know difference in brightness was perceptible) Every participant has equal probability of being placed in any experimental condition. Researcher obtains participants" scores on a measure known to be relevant to the outcome of experiment. Participants are ranked on this measure from lowest to highest, and are matched by being put into clusters/blocks of size k (k = number of conditions in experiment)
