(R Companion Ch 6, Exercise 2, 14 pts): Variables: age2, int_info_scale.) Are older people interested in a wider variety of social, economic, political, and scientific issues than are younger people? Or do younger people and older people not differ significantly in the scope of their interests? The gssD dataset contains int_info_scale, which measures respondents' level of interest in 10 different issue areas. Scores range from 0 to 20, with higher scores denoting higher levels of interest. The gssD also has age2, which takes on two values: "=31" for respondents older than 30. Run wtd.ttestC, using int_info_scale as the dependent variable and age2 as the independent variable.

A.

Statistics for int_info_scale Level of Interest Mean for younger group (=31 years old) ? Mean difference '? Lower 95% Cl '? Upper 95% CI ? t-statistic ? P-value