Under what conditions can an experimenter be confident that X is ...

[burchfield96]

Under what conditions can an experimenter be confident that X is the cause of Y if two variables, X and Y, are strongly correlated?
 
  A) if people are randomly assigned to levels of X in a true experiment
  B) if people are randomly assigned to levels of Y in a true experiment
  C) if X is measured before Y
  D) if Y is measured before X

Question 2

An assumption for a significance test of the correlation coefficient is that in the populations,
 
  A) the variance of each variable is the same.
  B) the variance of the deviation scores for each variable is the same.
  C) the variance of each variable is the same at each point of the other variable.
  D) the variance of the squared deviations of each variable is the same at each point of the distribution of the squared deviations of the other variable.

[yasmina]

Answer to Question 1

A

Answer to Question 2

wohoo thank youuu.

[burchfield96]

Excellent

[carojassy25]

Gracias!