Question

1.explain what role the placebo plays in a science experiment.
2.Describe the main draw back of a case study

Answer 1

In a science experiment, a placebo acts like a controlled variable. Some people may think that they took the actually thing and their mind accepts the fact that they took (for example) the pill, when they actually took a fake.
( http://openstudy.com/study#/updates/523c51aee4b0fbf3cc7b7faa )

Usually the cases have no one correct solution. The group leader does not suggest an answer. The group as a whole must reach consensus and resolve the problem.
( http://en.wikipedia.org/wiki/Case_study_in_psychology )