a test procedure in which the identity of those receiving the intervention is concealed from both the administrators and the subjects until after the test is completed designed to reduce or eliminate bias in the results
एक परीक्षा प्रक्रिया जिसमें हस्तक्षेप प्राप्त करने वालों की पहचान दोनों प्रशासकों और विषयों से छिपाई जाती है