A Study Determined That in 2009, 38% of Those in a Random

Multiple Choice

A study determined that in 2009, 38% of those in a random sample of 100 adult Americans had accounts with some type of social web site. In a similar survey conducted in 2012, 53% reported having accounts. Suppose that the 2012 figure was also based on a random sample of size 100. The 95% confidence interval for the difference in population proportions, P₂₀₁₂-P₂₀₀₉ , is: ​

A) 0.15 ± 0.088
B) 0.29 ± 0.136
C) 0.15 ± 0.136
D) 0.29 ± 0.88
E) 0.00 ± 0.136