A regression was run to determine if there is a relationship between the happiness index (y) and life expectancy in years of a given country (x). The results of the regression were: y^=a+bx ; a=-0.423...

 A regression was run to determine if there is a relationship between the happiness index (y) and life
expectancy in years of a given country (x). The results of the regression were: y^=a+bx ; a=-0.423 ,
b=0.07

a. Write the equation of the Least Squares Regression line.
b. Find the value for the correlation coefficient, r?
c. If a country increases its life expectancy, the happiness index will Increase or decrease ( circle
one)
d. If the life expectancy is increased by 1 year 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 85
years. Round to two decimal places.-