Dr Vigrosky is testing the effectiveness of a new drug, called ...

[bobbysung]

Dr Vigrosky is testing the effectiveness of a new drug, called Xiptoflux, which is
  supposed to alleviate certain symptoms which accompany restless leg syndrome.
 
   Dr
  Vigrosky gives one group of participants, who suffer from RLS, a drug which has
  already been approved by the FDA. He gives another group of participants, who suffer
  from RLS, the new drug, Xiptoflux. He found no significant difference between the
  new drug and the old drug in terms of the alleviation of the symptoms of restless leg
  syndrome. What aspect of Dr Vigrosky's design could be improved in subsequent trials
  of the study?
  A) He could have compared the two drugs to a third restless leg syndrome drug
  B) He could have used an experimental group
  C) He could have used a placebo control group
  D) He could have given the new drug to a group of people who do not suffer from
  RLS

Question 2

How were the animals in the study by Terkel and Rosenblatt ( 1968 ) treated
  differently?
 
  A) amount of food
  B) amount of exercise
  C) type of injection
  D) type of environment

[Ahernandez18]

Answer to Question 1

C

Answer to Question 2

C