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.
Question 2
When testing the significance of the correlation coefficient, the null hypothesis is usually that in the population, the true correlation
A) is less than 1.
B) is zero.
C) is greater than the actual correlation.
D) is less than the actual correlation.
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