Nghiên cứu viên phải trả lời câu hỏ

Nghiên cứu viên phải trả lời câu hỏi họ sẽ thu thập dữ liệu từ ai? ở đâu? Khi nào? Làm thể nào để có thể cân bằng giữa việc chọn lọc dữ liệu và việc thu thập tất cả các dữ liệu yêu cầu?

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Researchers must answer the question they will collect data from anyone? where are you? When? How to balance between the data selection and collecting all the required data?

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Researcher have to answer questions they will collect data from anyone? where? When? How can there be a balance between the selected data and collecting all the data required?

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