A researcher wishes to estimate the number of households with two tablets. What size sample should be obtained in order to be 90% confident that the sample proportion will not differ from the true proportion by more than 3%? A previous study indicates that the proportion of households with two tablets is 19%. A) 463 B) 3 C) 281 D) 572 A university dean is interested in determining the proportion of students who receive some sort of financial aid. Rather than examine the records for all students, the dean randomly selects 200 students and finds that 118 of them are receiving financial aid. If the dean wanted to estimate the proportion of all students receiving financial aid to within 4% with 90% reliability, how many students would need to be sampled? A) 99 B) 249 C) 410 D) 17