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In a clinical trial testing a new arthritis medication versus placebo, researchers use a double-blind design where neither patients nor the doctors evaluating outcomes know which patients received the medication. Which of the following biases or effects does this design help prevent? (Select all that apply)
In a clinical trial testing a new arthritis medication versus placebo, researchers use a double-blind design where neither patients nor the doctors evaluating outcomes know which patients received the medication. Which of the following biases or effects does this design help prevent? (Select all that apply)