Different countries sell a variety of drugs at different prices. For each of the 10 popular prescription drugs, the file contains a list of the retail price (US$) for the drug in different countries....

Different countries sell a variety of drugs at different prices. For each of the 10 popular prescription drugs, the file contains a list of the retail price (US$) for the drug in different countries. Use the data in Drug Prices to calculate the answers to the problem.

(a) Compute the correlation coefficient for these sample data.

(b) What inferences can you make about the 10 popular prescription drugs and the different costs per country?