A poll asked the question, "What do you think is the most significant problem facing this country today?" Twenty-one percent of the respondents answered "crime and violence." The margin of sampling error was plus or minus 4 percentage points. Following the convention that the margin of error is based on a 95% confidence interval, find a 95% confidence interval for the percentage of the population that would respond "crime and violence" to the question asked by the pollsters.
Find the upper limit and lower limit