An experiment is a procedure that tests a hypothesis by the process of collectinginformation under controlled conditions.
<h3>What is a controlled scientific test of hypothesis ?</h3>
A controlled experiment is a scientific test done under controlled conditions, meaning that just one (or a few) factors are changed at a time, while all others are kept constant.
Controlled experiment. an experiment that compares the effect of one manipulated variable to a group that receives no treatment. controlled variables. factors that should be kept the same in both the treatment group and the non-treated group.
A vaccine is a substance containing incomplete portions of a virus that produce an immune response when injected into the body. It <span>is a biological preparation that provides active acquired immunity to a particular disease. Hope this answers the question. Have a nice day.</span>