30. Which of the following statements about scientific research design is true? A. Research designs are an essential and valuable tool that allows researchers to meet the goals of science.
the goals of science.
B. All research designs demonstrate cause-and-effect, or cause-and-effect can be inferred from the results obtained.
C. All research designs involve some kind of manipulation of the variables that operate in a study.
D. All research designs are quantitative.
Ans: A
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