Experimenters manipulate independent variables and control extraneous variables.
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Q1: Between-subjects experiments do not control extraneous variables.
Q2: Random selection and random assignment are the
Q3: Experiments must be done in a laboratory.
Q4: Placebos are only effective for psychological conditions
Q5: In a between-subjects experiment, each participant is
Q7: Rosenthal and Fode's "maze-dull" rats (1963) had
Q8: Darley and Latané (1968) manipulated the number
Q9: A double-blind study is one in which
Q10: Research has shown that people in pain
Q11: A new headache treatment is proved effective
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