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_____ is defined as the exponential expansion of word-of-mouth.
Experimental Methods
Techniques and procedures used in science to study and manipulate variables to establish cause-and-effect relationships.
Blind Studies
Research designs in which the participants do not know whether they are receiving the experimental treatment or a placebo.
Significance Tests
Statistical tests that show how likely it is that a study’s results occurred merely by chance.
Correlation
A measure of how strongly two variables are related to one another.
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