Question: 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

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=-0.522 b=0.169 (a) Write the equation of the Least Squares Regression line of the form y= (b) Which is a possible value for the correlation coefficient, r? O-1.997 O-0.949 O 0.949 O 1.997 (c) If a country increases its life expectancy, the happiness index will O increase O decrease (d) If the life expectancy is increased by 4 years in a certain country, how much will the happiness index change? Round to two decimal places

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