6.11.2. Stigler (1986, p. 6) reported data from Cassini (1740) on the angle between the plane of the equator and the plane of the Earth’s revolution about the Sun. The data are given in Table 6.9. The years −229 and −139 indicate 230 B.C. and 140 B.C. respectively. The angles are listed as the minutes above 23 degrees.

Plot the data. Are there any obvious outliers (weird data)? If outliers exist, compare the fit of the line with and without the outliers. In particular, compare the different 95% confidence intervals for the slope and intercept.