Heidi is running a study for a large mental health center. She is responsible for assigning participants to one of two conditions--either the condition that receives the medicine being tested or a placebo pill. The actual nurses and doctors administering the medication or placebos do not know which they are giving, nor do the patients know which they are receiving. Only Heidi tracks this
information. Heidi's study uses a(n) design.
a. blind
b. double-blind
c. triple-blind
d. biased
b
Psychology
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