1. can investigator variables affect the data of a questionaire with closed questions?
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2. which observation method controls the most extraneous variables?
3. which type of interview is most likely to give qualitative data ?
- unstructured interview
- structured interview
4. Between structured and unstructured interviews which one can be tested to measure how reliable the results are?
5. Is "lack of ecological validity" a disadvantage for structured or unstructured interviews?