For the years 1998–2008, production in the U.S. energy sector included the quantities shown here. The variables represent total energy production as well as energy production from nonrenewable fossil fuels. The units are in quadrillion Btu and the data are also in file XR17045. For these data, and with y = total energy production, generate the correlation matrix for the independent variables and comment on the possible presence of multicollinearity.
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