A mail-order company is interested in whether or not “order rates” (the percent of catalogs mailed that result in an order) vary from one region of the country to another. Table 17.4.5 gives recent data on the number of catalogs mailed that produced an order, and the number that did not, according to region.
a. Find the order rate (as a percentage) for each region. Which region appears to order at a higher rate on a per-catalog basis?
b. Are the order rates significantly different between these two regions? How do you know?