What type of research involves a scientific investigation in which a researcher manipulates a test group and compares the results with those of another group that did not receive the experimental manipulations?
A) focus group
B) controlled experiment
C) interpretative research
D) trend analysis

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The Answer of What type of research involves a scientific investigation in which a researcher manipulates a test group and compares the results with those of another group that did not receive the experimental manipulations?
A) focus group
B) controlled experiment
C) interpretative research
D) trend analysis

What Type of Research Involves a Scientific Investigation in Which