Consider a completely randomized experiment in which a control group is given a placebo for congestion relief and a treatment group is given a new drug for congestion relief. Describe a double-blind procedure for this experiment and discuss some benefits of such a procedure.
In this procedure the drug and the placebo should be given in such a way so that researcher or no one in both of that group will not know which drugs are given to them.
1. The procedure increase the reliability and validiy of the experiments.
2. Avoid errors arising from biasness.