Which statement is always true?
O If two variables have a negative correlation, then the variables do not have a cause-and-effect
relationship.
O If two variables do not have a cause-and-effect relationship, then the variables have no
correlation.
O If two variables have a cause-and-effect relationship, then the variables will have a correlation.
O If two variables have a positive correlation, then the variables have a cause-and-effect
relationship.