5. Interpret the slope of the regression line in context. Remember that an interpretation must include a number and units, in a sentence that explains the meaning. 6. Use the regression line to predict the life expectancy for a country with a mean happiness index of 5. Show your calculation. 7. Is the prediction you found in (8) likely to be close to the actual life expectancy for a country with a mean happiness index of 5? Explain how you know based on the graph and correlation value. 8. Look at the scatterplot. There is a dot for a country with a mean happiness index of 4.3 and a mean life expectancy of only 40.5 years. Refer to this point to answer the following questions. a) What is the mean life expectancy observed for this country? b) What would the regression line give as the predicted mean life expectancy for this country? Show your calculation. c) Calculate the residual for this point. Show your calculation. d) Explain the sign of the residual in context. (Why is it the sign that it is?)