Confidence Intervals for Population Proportion: Videos & Practice Problems

A recent survey in $2018$ found that $12\%$ of U.S. adults regularly shop online for groceries. The research community wants to estimate the current percentage of adults who engage in online grocery shopping. To obtain a confidence level of $95\%$ and a margin of error of $2$ percentage points, how many adults must be surveyed if nothing is known about the current rate of online grocery shopping?