Survey on biggest problems for us teens a recent study1 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.