Given a regression equation Y = 77.23 - .277(X1), where X1 = IMR (infant mortality rate, measured as the number of deaths per 1,000 births), which of the following is true? Question 1 options: When IMR increases by 1 per thousand, life expectancy decreases by .277 years When life expectancy decreases by 1 year, IMR decreases by .277 When IMR increases by 1 per thousand, life expectancy increases by .277 years When life expectancy increases by 1 year, IMR decreases by .277