Did you conclude in case 4.1 that the earth has warmed since 1880 and that there is some linear relationship between CO2 and temperature anomalies? If so, here is another look at the same data. C04-02a lists the temperature anomalies from 1880 to 1940, C04-02b lists the data from 1941 to 1975, C04-02c stores the temperature anomalies from 1976 to 1997, and C04-02d contains the data from 1998 to 2013. For each set of data, draw a line chart and report your findings.