If a researcher is assigning subjects to different conditions of an experiment based on their responses to a pre-experimental questionnaire, the researcher is probably making use of the __________ method of equating groups

The text uses an example of overlapping dose-response curves for slowed reaction time, ataxia (staggering), and coma to illustrate

A. how different drugs have different effects. B. that different drug-related effects can have different thresholds. C. the placebo effect. D. the grapefruit-juice effect.

For any trait, a high MZ and a low DZ concordance value supports the probability that the trait is most likely due to a(n) _____________

Fill in the blank(s) with the appropriate word(s).