Use the Following to Answer the Questions Below

Use the following to answer the questions below:
Identify whether each of the following scenarios describe a randomized comparative experiment or a matched pairs experiment.
-On their website, the makers of Cold-EEZE lozenges provide links to studies done to demonstrate the effectiveness of their product at shortening the duration of the common cold. One study, published in the Annals of Internal Medicine, is described as a "randomized, double-blind, placebo-controlled"
study. Briefly explain what the phrase "randomized, double-blind, placebo-controlled"
means.