Answer:
Based on the purpose and method, we could distinguish among 5 research design types:
Descriptive research design. ...
Correlational research design. ...
Experimental research design. ...
Diagnostic research design. ...
Explanatory research design.
Research design is needed because it facilitates the smooth sailing of the various research operations, thereby making research as efficient as possible yielding maximal information with minimal expenditure of effort, time and money. Research design has a significant impact on the reliability of the results obtained.
Explanation:
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