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

Question

Quizplus · Accepted Answer

Making a scatter diagram allows you to visually estimate the degree and direction of correlation, which can serve as a check on the calculations of the correlation coefficient. It is important to have an understanding of the relationship between the variables before calculating the correlation coefficient. The other answer choices are not true - a clear line does not negate the need for a correlation coefficient, there are not different procedures for positive or negative correlations, and a clear curvilinear correlation does not necessarily warrant figuring a correlation coefficient.

It Is a Good Idea to Make a Scatter Diagram