Within-subjects designs allow a researcher to test causal hypotheses with confidence and without
A) mistakes.
B) statistical analyses.
C) randomization.
D) any form of bias.
Question 2
Random assignment of participants to conditions gives us confidence that
A) the researcher will remain blind to the condition under which each participant is tested.
B) the groups to be compared are equivalent at the start of the study.
C) the participants will remain blind to condition throughout the experiment.
D) any placebo effect will be nullified.
Four hypotheses on how populations might relate to one another along an environmental gradient.
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