Call me: A sociologist wants to construct a 99% confidence interval for the proportion of children aged 8-10 living in New York who own a smartphone. Part: 0/3 Part 1 of 3 (a) A survey by the National Consumers League estimated the nationwide proportion to be 0.27. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.027 A sample of children aged 8-10 living in New York is needed to obtain a 99% confidence interval with a margin of error of 0.02 using the estimate 0.27 for p.