Question

Cole was involved in a research study to find out if a particular medicine was safe and could help prevent meningococcal disease in healthy teenagers. some of the study participants received a shot with no medicine in it (a placebo), while other participants received a shot containing the medicine. neither the doctor nor cole would know what shots were being administered or whether cole was in the experimental or control group. this type of study is known as a(n):

Answer 1

Based on the description, i believe the type of study is known as: a double-blind study

In double blind study, both the participants and the examiners will know who is receiving the special treatment for this study.  This type of study is conducted in order to prevent bias and placebo effect.<span />