In survey conducted by quinnipiac university from october 25-31, 2011, 47% of a sample of 2,294 registered voters approved of the job barack obama was doing as president. what is the 99% confidence interval for the proportion of all registered voters who approved of the job barack obama was doing as president? (0.443, 0.497) correct. we can be 99% confident that the proportion of all registered voters who approved of the job barack obama was doing as president is between 0.443 and 0.497. (0.460, 0.480) (0.453, 0.487) (0.450, 0.490)