In medical experiments, half of the participants are given the medication, and the remaining participants are given a placebo. A placebo is an inactive substance such as a sugar pill that looks identical to the medication. By utilizing a placebo, the study remains free from being altered as neither the participants nor the researcher knows who is receiving the medication. Comparison:
Random assignment:
Control:
Replication:

Is this a blind experiment or a double blind experiment? Why or why not?