For mail with a high priority, “Express Mail” offers next day delivery by 12:00 noon to mo...

For mail with a high priority, “Express Mail” offers next day delivery by 12:00 noon to most destinations, 365 days of the year. The service was first offered by the U.S. Postal Service in the early 1980s and has been growing in use ever since. The cost of the service (in cents) for selected years is shown in the table. (a) Draw a scatterplot of the data, then (b) decide if the association is positive, negative, or cannot be determined.

Source:2004 Statistical Abstract of the United States; USPS.com