Before-and-after designs have no control or comparison groups.
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Q51: This problem occurs when the groups become
Q52: This term refers to when comparison group
Q53: Changes in outcome scores during experiments that
Q54: A time series before-and-after quasi-experimental design makes
Q55: Although cross-population generalizability is difficult to achieve
Q57: True experiments require random assignment of subjects
Q58: True experiments can have only two comparison
Q59: Field experiments allow greater control over conditions
Q60: The variable used to specify a cutoff
Q61: Why aren't experiments very generalizable? What can
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