Carbon dioxide emissions have been found to be responsible for global warming by many scientific studies. In order to determine lower carbon dioxide emissions, the government of Mantasia, an island nation in the South Pacific, recently conducted a survey of some citizens. The survey contains information on respondents' carbon emissions, as well as a range of demographic variables and indicators of political party preference. The government has requested that you study the survey to determine the best way of lowering carbon emissions. A summary of the variables is given below.

PERSONID: The unique identifier number for the survey respondent. Dependent variable:

EMISSIONS: Number of tonnes of carbon dioxide produced per year. Explanatory variables:

NO. OF CARS: Number of cars owned by the respondent.

INCOME: Personal income (in $1000).

AGE: Age of respondent (in 10s of years). Gender variable:

FEMALE: Indicator variable for if the respondent is female (1 = female, 0 = otherwise).

Political party preference can be divided into three categories.

LABOUR: Indicator variable for if the respondent votes for Labour (1 =Labour, 0 = otherwise).

LIBERAL: Indicator variable for if the respondent votes for Liberal (1 = Liberal, 0 = otherwise).

GREENS: Indicator variable for if the respondent votes for Greens (1 =Greens, 0 = otherwise)

SUMMARY OUTPUT Regression Statistics Multiple R 0.867 R Square 0.752 Adjusted R Square 0.747 Standard Error 3.559 Observations 301 ANOVA df SS MS F Significance F Regression 6 11303.902 1883.984 148.761 5.28673E-86 Residual 294 3723.362 12.664 Total 300 15027.264 Coefficients Standard Error t Stat P-value Lower 95% Upper 95% Intercept 4.924 1.024 4.806 0.000 2.907 6.940 NO. OF CARS 5.362 19.998 0.000 4.835 5.890 INCOME 0.100 0.005 21.729 0.000 0.091 0.109 AGE 0.121 3.670 0.000 0.206 0.684 FEMALE 0.289 0.411 0.703 0.483 -0.520 1.097 LABOUR 1.479 0.752 1.967 0.050 -0.001 2.959 LIBERAL 2.791 0.704 3.963 0.000 1.405 4.176