All of the following are threats to the internal validity of a study except
a. failure to randomly assign participants.
b. assigning participants based on gender.
c. varying only the independent variable.
d. randomly changing several aspects of the study in addition to the independent variable.
Answer: C
Psychology
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What etiology for Alzheimer's disease is suggested by the presence of beta-amyloid at the core of amyloid plaques?
a. dopamine deficiency b. radiation overdose c. immune system dysfunction d. circulatory system dysfunction
Psychology
Piaget stated that children's theories about the world
a. remain the same until adulthood. b. undergo three major changes during development. c. are never tested by the children. d. are based on what adults tell them.
Psychology