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Current Attempt in Progress Survey on Biggest Problems for US Teens A recent study found that anxiety/depression topped the list of problems teens see among their peers. In the representative sample of 920 US teens (ages 13 to 17), 644 said that anxiety/depression is a major problem among people their age in the community where they live. Use Statkey or other technology to find the standard error from a bootstrap distribution, and then use the standard error to find a 95% confidence interval for the proportion of US teens who believe anxiety and depression are major problems for their peers. Click here to access StatKey. to