A 20152015 survey found that 45%45\% of adults in the U.S. regularly use smartphones for shopping. The research community is interested in estimating the current percentage of adults who shop using smartphones. To obtain a 95%95\% confidence level and a margin of error of 33 percentage points, how many adults must be surveyed now, based on the 20152015 survey's result?

A 20152015 survey found that 45%45\% of adults in the U.S. regula...

Confidence Intervals for Population Proportion: Videos & Practice Problems