The double - blind technique involves:
Correct answer: D. a procedure in which neither patients nor health care staff know whether a given patient is receiving a drug or placebo
- A. the simultaneous use or two or more therapeutic treatments in the hope that at least one will be effective.
- B. replacing a positive response to a harmful stimulus with a negative response.
- C. blocking anxiety - arousing material from consciousness during therapy.
- D. a procedure in which neither patients nor health care staff know whether a given patient is receiving a drug or placebo
Explanation
In a double-blind procedure, neither the participants nor the researchers or healthcare staff know who receives the active treatment and who receives the placebo. This reduces expectancy and observer bias.
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