Discussion
The phrase 'Controlled Group' is used in :
Answer: D
The phrase 'controlled group' is used in experimental research.
An experiment compares an experimental group, which receives the treatment, with a control (controlled) group, which does not but is otherwise as similar as possible. Any difference in outcome can then be put down to the treatment, which is what lets an experiment test cause and effect.
Survey research collects data from a sample without intervening, historical research studies past records, and descriptive research describes a situation as it is. None of these manipulates a variable, so none needs a control group.
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