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Correct Answer: C) Sample.
Correct Answer: A) Observational.
Correct Answer: D) All of them.
Correct Answer: B) Dependent variable.
Correct Answer: A) Yes.
Correct Answer: D) Quasi-experiments.
Correct Answer: B) DESCRIPTIVE RESEARCH.
Correct Answer: D) Time series experiments.
Correct Answer: C) Experimental method.
Correct Answer: B) To write testable hypothesis.