A report from the U.S. Department of Health and Human Services estimated that 10.2% of Americans in 2014 had used illicit drugs with a margin of error of 0.18%. Suppose that many of those asked about their behavior give an answer that isn't the truth because they fear that their answer will go to law enforcement officials. This is a sampling error that increases variability. This is a nonsampling error that causes bias. This is a nonsampling error that increases variability. This is a sampling error that causes bias