Researchers should make a scatter diagram before figuring correlation coefficients because
A) there is no point in figuring the correlation if a clear line is formed.
B) there are different procedures depending on whether there appears to be a positive or a negative correlation.
C) it provides an estimate the degree and direction of correlation to provide a check on calculations.
D) a correlation coefficient should only be figured if a clear curvilinear relationship is observed.
Answer: C
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