Question:

If a researcher observes both an increase of cyberbullying and an increase in suicide, s/he can claim that the two variables a) have a Hawthorne effect. b) are experimental. c) are correlated. d)

If a researcher observes both an increase of cyberbullying and an increase in suicide, s/he can claim that the two variables 
a) have a Hawthorne effect. 
b) are experimental. 
c) are correlated. 
d) are controlled.

If a researcher observes both an increase of cyberbullying and an increase in suicide, s/he can claim that the two variables a) have a Hawthorne effect. b) are experimental. c) are correlated. d) are controlled.