Random selection is for identifying causal relationships between variables.
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Q15: Neither anonymity nor confidentiality can be assured
Q16: Compared to observational analysis, data from surveys
Q17: A sociogram is better than descriptive notes
Q18: Indicators are variables, such as those provided
Q19: A cover letter accompanies or precedes a
Q20: Researchers must choose their site and select
Q22: Ethnographic research produces rich data but data
Q23: Mail questionnaires were used in the "open
Q24: Reliability refers to whether a variable measures
Q25: Announced observational studies usually do not need
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