I need help with the relationship between life expectancy and health expenditure I need help knowing what type of analysis was just conducted In this…

I need help with the relationship between life expectancy and health expenditure

I need help knowing what type of analysis was just conducted

In this problem, whet could be considered selection bias, and how that might bias the findings if it were to be a causal analysis

If someone wanted to donate money to health expenditure to improve life expectancy. Whichh type of analysis should she use to help her decide if those gifts will help her get to that goal.