Which of the following relationships between two variables can be ...

[meagbuch]

Which of the following relationships between two variables can be proven by a correlational study?
 
  a. Variable A causes variable B.
  b. Variable B causes variable A.
  c. A third variable (C) causes both variable A and B.
  d. None of the above can be proven by a correlational study.

Question 2

In the analysis of heritability, one potential problem in the double-the-difference method is that it assumes that twins
 
  a. do not differentially interact with each other.
  b. are the same sex.
  c. are genetically identical.
  d. are reared under equal environments.

[Ptupou85]

Answer to Question 1

Answer: d: None of the above can be proven by a correlational study.

Answer to Question 2

Answer: d: are reared under equal environments.

[meagbuch]

TYSM

[AngeliqueG]

Thanks for the timely response, appreciate it