Ilimiy is tiykarlari

Double-blind studies

The concept of a double-blind study is very similar to that of a blind study except that it also tries to eliminate researcher bias by concealing the identity of the experimental and placebo groups from the researcher. In other words, in a double-blind study neither the researcher nor the study participants know who is receiving real and who is receiving fake treatment or which treatment model they are receiving.
Lecture 7
CONSTRUCTING AN INSTRUMENT FOR DATA COLLECTION

In this lecture you will learn about:

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  Major approaches to information gathering
  
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  Collecting data using primary sources
  
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  Observation
  
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  The interview
  
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  The questionnaire
  
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  Methods of data collection in qualitative research
  
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  Collecting data using secondary sources
  

Keywords:

Closed questions, content analysis, double-barreled questions, elevation effect, error of central tendency, focus group, Hawthorne effect, interview schedule, leading questions, non-participant observation, open-ended questions, oral history, participant observation, primary data, primary sources, questionnaire, secondary data, secondary sources, structured interview, unstructured interview.