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17. Which of the following statements (a, b, or c) is the best interpretation of the correlation coefficient? a. When a bank increases the 30-year rate, that causes the 15-year rate to rise as well. b. Interest rates are determined by economic conditions. When economic conditions cause 30- year rates to increase, these same conditions cause 15-year rates to increase as well. c. When a bank increases the 15-year rate, that causes the 30-year rate to rise as well