20. Scenario: Life Expectancy. It is known that the life expectancy of Western Europeans varies with the country of residency. One economist knows that the gross domestic product (GDP) of the countries in Western Europe vary and wonders if GDP affects life expectancy. The following set of data gives the per capita gross domestic product (GDP) and the life expectancy (Life_exp) of 10 Western European countries. Beam. Me: a) What is the predictor variable, response variable? I- l- a. Country, life expectancy. '- c. Gross domestic product, $10005 . ' d. Life expectancy, country. b. Gross domestic product, life expectancy