I am working on my Ph.D. research in education by conducting questionnaire, interview, and classroom observation. The questionnaire is 800. What is the sample size for interview and classroom observation, and is there a reference for this
You say "The questionnaire is 800" but did you mean that "The population is 800?"
I mean I am planning to collect 800 questionnaires
I suggest you revise the research design. Your current plan looks very difficult to me. Best wishes David Booth
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