The Kyoto Protocol was signed in 1997, and required countries to start reducing their carbon emissions. The protocol became enforceable in February 2005. In 2004, the mean CO2 emission was 4.89 metric tons per capita. Is there enough evidence to show that the mean CO2 emission is lower in 2008 than in 2004? State the random variable, population parameter, and hypotheses. State the random variable. Select an answer State the population parameter. Select an answer State the hypotheses. Ho: H?V Ha H?V