It Is a Good Idea to Make a Scatter Diagram

Multiple Choice

It is a good idea to make a scatter diagram before figuring the correlation coefficient. This is because:

A) there is no point in figuring the correlation if you can see a clear line formed
B) there are different procedures depending on whether there appears to be a positive or a negative correlation
C) it allows you to estimate the degree and direction of correlation to provide a check on your calculations
D) you should only figure a correlation coefficient if you see a clear curvilinear correlation