1. Given the information in Exercise 15.13, deter- mine and interpret the coefficients of correlation and determination for January-May burned acreage in Florida versus January-May rainfall in the state.

2. Given the information in Exercise 15.12, determine and interpret the coefficients of correlation and determina- tion for gross revenue versus the number of equity partners.

3. For each of 10 popular prescription drugs, file XR15042 lists the retail price (in U.S. dollars) for the drug in several different countries, including the United States, Canada, Great Britain, and Australia. Determine and interpret the coefficients of correlation and deter- mination for U.S. prices versus Canadian prices. Source: "Prescription Drugs Cheaper in Other Nations," USA Today, November 10, 1999, p. 2A.

4. For each of the 20 top-grossing U.S. films made during the 1990s, file XR15043 lists the domestic gross ticket sales versus foreign gross ticket sales (both in millions of U.S. dollars). Determine the linear regression equation relating the foreign gross as a function of the domestic gross. Identify and interpret the coefficients of correlation and determination. Source: "Overseas Grosses Outdoing North America," USA Today, December 13, 2000.