The central features of the classical experiment are variables, time order, measures, and groups. Like much of the vocabulary of research, the word experiment has acquired both a general and a specialized meaning. According to David Farrington, Lloyd Ohlin, and James Q. Wilson "the defining feature of an experiment lies in the control of the ______ by the experimenter."

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A. This is an incorrect answer because the central features of the classical experiment are variables, time order, measures, and groups. Like much of the vocabulary of research, the word experiment has acquired both a general and a specialized meaning. According to David Farrington, Lloyd Ohlin, and James Q. Wilson "the defining feature of an experiment lies in the control of the independent variables not the interval measures.
B. This is an incorrect answer because the central features of the classical experiment are variables, time order, measures, and groups. Like much of the vocabulary of research, the word experiment has acquired both a general and a specialized meaning. According to David Farrington, Lloyd Ohlin, and James Q. Wilson "the defining feature of an experiment lies in the control of the independent variables not the nominal measures.
C. This is an incorrect answer because the central features of the classical experiment are variables, time order, measures, and groups. Like much of the vocabulary of research, the word experiment has acquired both a general and a specialized meaning. According to David Farrington, Lloyd Ohlin, and James Q. Wilson "the defining feature of an experiment lies in the control of the independent variables not the dependent variables.
D. The correct answer is "D" because the central features of the classical experiment are variables, time order, measures, and groups. Like much of the vocabulary of research, the word experiment has acquired both a general and a specialized meaning. According to David Farrington, Lloyd Ohlin, and James Q. Wilson "the defining feature of an experiment lies in the control of the independent variables.

The Central Features of the Classical Experiment Are Variables, Time