The following data represent the number of unique visitors and the revenue a website generated for the months of July through December. 
(See the Excel Data File.)
A) What is the sample standard deviation for the number of unique visitors and the revenue?
B) Calculate the coefficient of variations. Which variable has a higher relative dispersion?
C) Calculate the sample correlation coefficient between the number of unique visitors and Revenue.
D) Comment on the strength of the linear relationship. What does this mean for the owner of the website?
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