If the estimated standard error of the mean for low income respondents is 0.26, the margin of error at a confidence level of 95% is _. Report the number rounded to the fourth decimal place (0.1234) without any other symbols. Years of Education by Income Standard Mean Cases Deviation Low 12.11 2.83 122 Income Middle 13.01 2.91 541 Income High 15.44 2.83 54 Income Total 717