Professor Golder is studying hyperactivity in preschool-age children. She is concerned that differences in child rearing, diet, and so forth may affect her results
To minimize these potential preexisting variables, she should be sure to do which of the following?
A) Use random assignment when forming her groups.
B) Include an independent variable.
C) Include a dependent variable.
D) Assign boys to the experimental group and
Answer: A
Rationale: In an experiment, it is the random assignment of participants to different groups that insures that the groups are roughly equal. This is important, because without random assignment, preexisting differences between participants could act as confounding variables and end up affecting the results. While the independent and dependent variables are also an important part of the experimental method, they do not help to control for preexisting variables.
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a. directly identify overt, observable traits. b. uncover hidden or unconscious thoughts and needs. c. measure verbal and performance intelligence. d. measure honesty or integrity.
This part of the brain is not fully developed in adolescence, which helps explain their poor judgement, planning, and decision making.
a. Temporal lobe b. Frontal lobe c. Occipital lobe d. Parietal
Preschoolers
A) have little or no ability to sustain attention. B) become more aware of their own mental life. C) have little or no ability to inhibit impulses. D) do not have the skills to engage in planning.
Because of the rapid growth of basic structures, the developing fetus is sensitive to a variety of diseases, drugs, and sources of radiation, especially during which part of the pregnancy?
a. first trimester b. second trimester c. third trimester d. neonatal period