12:26 1 il 5G ( y= 0.611 + 0.08 (b) Which is a possible value for the correlation coefficient, r? O-1.43 -0.879 1.43 O 0.879 (C) If a country increases its life expectancy, the happiness index will...

Extracted text: 12:26 1 il 5G ( y= 0.611 + 0.08 (b) Which is a possible value for the correlation coefficient, r? O-1.43 -0.879 1.43 O 0.879 (C) If a country increases its life expectancy, the happiness index will decrease o increase (d) If the life expectancy is increased by 2.5 years in a certain country, how much will the happiness index change? Round to two decimal places. (e) Use the regression line to predict the happiness index of a country with a life expectancy of 56. years. Round to two decimal places.