Mathematics, 18.03.2021 01:50 Messick127
1. A poll conducted in 2018 found that 54% of US adult Twitter users get at least some news on Twitter. The standard error for this estimate was 2.4%, and a normal distribution can be used to model the sample proportion. Construct a 99% confidence interval for the fraction of US adult Twitter users who get some news on Twitter, and interpret the confidence interval in context.
Answers: 2
, and a confidence level of 
, we have the following confidence interval of proportions.
, and s is the standard error.
, z is the value of Z that has a pvalue of 
, so 
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