Table 11.3.14 gives mailing-list size (thousands of names) and sales (thousands of dollars) for a group of catalogs.
a. How strong is the association between these two variables? Find the appropriate summary measure and interpret it.
b. Find the equation to predict sales from the size of the mailing list.
c. What level of sales would you expect for a catalog mailed to 5,000 people?
d. What percent of the variation in list size can be explained by the fact that some generated more sales than others?
e. Is there a significant relationship between list size and sales? How do you know?

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TABLE 11.3.14 Mailing Lists List Size Sales 5,178 2,370 3,591 2,056 List Size Sales 168 21 94 39 7,325 2,449 15,708 2,469 249 43 589