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a) Discuss brieflythe types of research studies undertaken in educational research. (500 words)

b) Explain the concept of validityof an experimental design with special reference to internal validityand external validity. (500 words)

c) Explain the concept and techniques of probabilitysampling? Select a research problem which can be conducted byusing multi-stage sampling technique? Elaborate the stages you would followwhile drawingsample for the studywith justification. (500 words)