9.12. For nations listed in the Human Development Report, the correlation with percent ofpeople using the Internet is 0.888 for per capita gross domestic product (GDP, a summary description of a nation's wealth), 0.818 for percent using cell phones, 0.669 for literacy rate, -0.551 for fertility rate (the mean number of children per adult woman), and 0.680 for per capita emissions of carbon dioxide,

(a) Explain how to interpret the sign ofthe correlation between Internet use and (i) GDP. (ii)

fertility rate.