Social Studies, 02.01.2020 21:31 starbae1084

If a researcher studies the effectiveness of anti-drug commercials by comparing the self-reported frequency of drug use among teens six months before and six months after the commercial aired, she is using an design.
a. cross-lagged panel
b. cross-sectional
c. ex post facto
d. pretest/posttest

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If a researcher studies the effectiveness of anti-drug commercials by comparing the self-reported fr...