Answer:
Experimental Research Design
Explanation:
Experimental Research Design is a scientific research design in which observations are examined under controlled conditions. It implies examining effect of independent variable on dependent variable, where independent variable is manipulated through interventional treatment & those interventions' effect on dependent variable is observed.
'Assessment whether classical music increases child's creativity' is Experimental Research Design. As : Independent Variable - classical music is provided & not provided to two groups (respectively) in controlled environment, and its impact on Dependent Variable - Creativity test ; is observed.
