we builded the following scatter plot with the smooth curve and the estimated line.

The HDI summarizes the progress in health, education and economics of a country with a number. GDPPC tries to summarize, wealth produced by a country in a single number. We have data for 172 countries.

a - should we use pearson's or spearman's correlation to write the intensity link between the GDPPC and the HDI ? Why ?

note : pearson's corr = 0.75 and spearman's corr = 0.94

b - Describe the association between the GDPPC and the HDI. (Include the correlation in the description)

droite estime courbe lisse 6'0 O 8 Oo 0.8 0.7 O HDI 0.6 0.5 0.4 0.3 0 10000 20000 30000 40000 50000 60000 70000 GDPPC droite estime courbe lisse 6'0 O 8 Oo 0.8 0.7 O HDI 0.6 0.5 0.4 0.3 0 10000 20000 30000 40000 50000 60000 70000 GDPPC