Meredith is a doctor whose patients are participants in a research study testing a new cholesterol medication.Neither Meredith nor her patients knows whether the patients are receiving the new experimental drug or a placebo.This is an example of:

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This is an example of a double-blind experiment because both Meredith and her patients are unaware of which group is receiving the medication and which group is receiving the placebo. This ensures that the results of the study are not influenced by any biases or preconceived notions that Meredith or her patients may have. Random assignment may have been used to assign patients to different groups, but it is not the main characteristic of this study design. A confounding variable would be an extraneous variable that could affect the outcome of the study, but this is not explicitly mentioned in the scenario. A single-blind experiment would involve only the patients being unaware of which group they are assigned to, while the doctor knows who is receiving the medication and who is receiving the placebo.

Meredith Is a Doctor Whose Patients Are Participants in a Research