Dr. Riley wanted to know if adolescent computer use has an immediate effect on sustained attention. Dr. Riley assigned participants into one of two groups (computer use vs. no computer use) by flipping a coin. Dr. Riley used
A) matching.
B) random assignment.
C) a correlational design.
D) a field experiment.
Answer: B
Psychology
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Melatonin is a _______________ that causes you to feel sleepier when it increases in the bloodstream
a) hormone b) sleeping pill c) depressant d) stimulant
Psychology
The two research methods scientists use to measure whether and how children change over time are
A) correlational and experimental research. B) correlational and observational research. C) cross-sectional and experimental research. D) cross-sectional and longitudinal research.
Psychology