| http://www.w3.org/ns/prov#value | - What is the independent variable?A)happinessB)life satisfactionC)optimismD)reading material17_____ refers to the degree to which an experimental design reflects the real-world issues it was meant to address.A)External validityB)Internal validityC)Experimenter biasD)Operational definition18A research study that assesses participants in a laboratory setting in February, May, and August is an example
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