Making a Scatter Diagram Before Figuring the Correlation Coefficient Is

Multiple Choice

Making a scatter diagram before figuring the correlation coefficient is a good idea because

A) there is no point in figuring the correlation if a clear line is formed on the graph.
B) there are different procedures depending on whether there appears to be a positive or a negative correlation.
C) it allows estimation of the degree and direction of correlation to provide a check on eventual figuring.
D) a correlation coefficient should be figured only if a clear curvilinear correlation is seen.