Question: HDI 2018 revisited As explained in Exercise 23, the Human Development Index (HDI) is a measure that attempts to summarize in one number the progress

HDI 2018 revisited As explained in Exercise 23, the Human Development Index (HDI) is a measure that attempts to summarize in one number the progress in health, education, and economics of a country. The percentage of older people

(65 and older) in a country is positively associated with its HDI. Can the percentage of older adults be used to predict the HDI? Here is a scatterplot of the two variables.

a) Explain why fitting a linear model to these data might be misleading.

b) If you fit a linear model to the data, what do you think a scatterplot of residuals vs. predicted HDI will look like?

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