Exhibit 2-1
-Exhibit 2-1 shows movements of two variables, X and Y, from 2007 through 2016. From this diagram the most one can conclude is that
A)X and Y are positively correlated with each other.
B)X and Y are negatively correlated with each other.
C)X and Y are positively correlated with each other and either X causes Y or Y causes X.
D)we cannot say anything about how X and Y are related because we do not know the units of measurement for X and Y.
E)X and Y are not correlated with each other.

Question

Exhibit 2-1 
-Exhibit 2-1 shows movements of two variables, X and Y, from 2007 through 2016. From this diagram the most one can conclude is that
A)X and Y are positively correlated with each other. 
B)X and Y are negatively correlated with each other. 
C)X and Y are positively correlated with each other and either X causes Y or Y causes X. 
D)we cannot say anything about how X and Y are related because we do not know the units of measurement for X and Y. 
E)X and Y are not correlated with each other.

Quizplus · Accepted Answer

If the movements of two variables, X and Y, show a pattern where they tend to move in the same direction over time (both increasing or both decreasing), this suggests a positive correlation between them. The specific units of measurement are not necessary to determine the direction of the correlation.

Exhibit 2-1 -Exhibit 2-1 Shows Movements of Two Variables, X and Y