What does it mean to say that the experiment was double blind

What does it mean to say that the experiment was double blind

It means that the blinding occurred at two levels.This is done in an effort to remove the possibility of bias in the experiment.Neither the participants or the researcher, no.(1) the 547 subjects in the placebo group were given pills containing no medication;(3) 546 subjects were in a group.

Who is getting the experiment item or the plus cibo.The children being injected didn't know whether they were getting the salt vaccine or a placebo.They say that if an observer like a camera or a person is watching the experiment then it collapses the wave function and two marks appear instead of an interference pattern.Accuracy in concluding that the outcome of an experiment is due to the independent variable.

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