Answer: (0.458,0.582)
Explanation:
Given : Sample size :

The proportion of U.S. adult Twitter users get at least some news on Twitter. :

Standard error :

Significance level :

Critical value :

The confidence interval for population proportion is given by :-

Hence, the 99% confidence interval for the fraction of U.S. adult Twitter users who get some news on Twitter, and interpret the confidence interval in context= (0.458,0.582)