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Experiment design considerations

AP.STATS: VAR‑3 (EU), VAR‑3.B (LO), VAR‑3.B.1 (EK), VAR‑3.C (LO), VAR‑3.C.1 (EK), VAR‑3.C.3 (EK), VAR‑3.C.4 (EK), VAR‑3.C.5 (EK), VAR‑3.C.8 (EK) CCSS.Math: HSS.IC.B.3

Problem

An experiment involving a new pain relief medication involves subjects being randomly assigned to one of two treatment groups. Subjects in one group will take a daily dose of the new medication, and subjects in the other group will take an existing common pain medication. All subjects will check in with a doctor every week to report their symptoms and any side-effects.
What does it mean for this experiment to be double-blind?
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