Question

The Malayo Colleges Mindanao recently conducted a study analyzing the privacy management habits of teen internet users. In a group of 116 teens, 80 reported having more than 100 followers on Twitter. Find the upper bound of a 90% confidence interval for the true proportion of teens who would report having more than 100 followers on Twitter. 

Answer 1

$CI=\mu +z\sqrt{\frac{p(1-p)}{n}}$

p=80/116=0.690

$CI=0.69+1.645\sqrt{\frac{0.69(1-0.69)}{116}}=80+0.07=0.76$