A survey from a random sample of households in a suburb included two questions "Have you visited a public library in the last year?" and "Are there children under 12 in your household?" The table below summarizes these results. Children under 12 No Children under 12 Total Visited a library 29 15 44 Didn't visit a library 40 105 145 Total 69 120 189 To construct a confidence interval, using theoretical methods, for the difference of the proportions of households with children under 12 who have visited a library in the last year and the proportion of households without children under 12 who have visited a library in the last year, we must compute the appropriate standard error, called SE. What is the SE