Examlex
The most common type of drainage system is
Experimental Research
A systematic and scientific approach to research in which the researcher manipulates one or more variables to observe the effect on some behavior or mental process.
Survey
A method of gathering information from a sample of individuals through questions to generalize findings to a larger population.
Experimentation
A method of scientific investigation involving the manipulation and controlled testing of variables to establish cause and effect relationships.
Correlational Research
A research method that examines the relationship between two or more variables to determine if a correlation exists.
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