Which of the following is a reason why we may NOT find a significant difference between two groups?
a. The sample size was too small.
b. The true mean difference between the groups was too small.
c. The variability between the groups was too large.
d. all of the above
D
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Explain the difference between random sampling and random assignment, and indicate how these procedures affect a study's internal and external validity
What will be an ideal response?
The chemical structure of cocaine is similar to which neurotransmitter?
a. dopamine b. acetylcholine c. GABA d. serotonin
Not only do media provide information and entertainment, but they also
A) cause depression among many adolescents. B) lead to high levels anxiety. C) help adolescents cope with the stress of everyday life. D) contribute to adolescents' multitasking abilities.
What does the fact that Kanzi learned language more completely than his mother did suggest about the acquisition of language?
A. It is gender-based. B. The brains of chimpanzees develop later than those of humans. C. Language learning is most effective when it is not direct. D. The acquisition of language is easier when it is introduced at an earlier stage of development.