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When was radio advertising first aired?
Scientific Investigation
A systematic procedure that involves the collection and analysis of data to create new knowledge or validate existing knowledge.
Data Collection
The process of gathering and measuring information on variables of interest in an established systematic fashion that enables one to answer stated research questions, test hypotheses, and evaluate outcomes.
Hypothesis
A proposed explanation for a phenomenon, made as a starting point for further investigation, which can be tested through research and experimentation.
Causal Factors
Elements or variables that directly influence the outcome or cause an event to occur.
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