(b) Explain what "randomized" means in this study. Subjects were a random sample. Subjects were randomly assigned a pain level. Subjects were randomly assigned to a price of the pill. Whether the subject experienced a reduction in pain or not was random. (c) Explain what "double blind" means in this study. Placebo pills were used. The subjects did not know which price of pill they were assigned. Neither the subject nor the researchers interacting with the subjects knew which group the subjects were in. Neither the subject nor the researchers interacting with the subjects knew whether or not the subject would experience a reduction in pain. (d) The researchers report "pain reduction was greater for the regular price pill (p-value