Why does a good experiment include a control group? a. it ...

[nevelica]

Why does a good experiment include a control group?
 
  a. it increases the number of people in the study, and hence, the generalizability of the results
   b. it gives us information about how participants would perform without experiencing the experimental treatment
  c. it eliminates the effects of external validity
  d. control groups have been an established part of scientific tradition for many decades

Question 2

What important assumption is required of the A-B-A withdrawal design in order to rule out rival hypotheses?
 
  a. that single participants will cooperate with long-term observations
  b. that the participant actually believes that the treatment will have an effect
   c. that the effects of the treatment are reversible upon withdrawal
  d. that the observation of the behavior is valid

[mfedorka]

Answer to Question 1

B

Answer to Question 2

C

[nevelica]

Thank you

[mfedorka]

No problemo