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15. In 1985, The Monterey Bay Aquarium began a survey program that involved randomly sampling visitors as they exit for the day. The survey includes visitor demographic information, use of social media, and opinions on their aquarium visit. In 2015, the survey included 356 visitors over age 65, of which 52 used a mobile device such as an Android phone or iPad during their visit. a) What is the margin of error of the large-sample 95% confidence interval for the proportion of visitors over 65 who used a mobile device during their visit? b) How large a sample is needed to get the common 13 percentage point margin of error? Use the 2015 sample as a pilot study to get p*