More than 4 million Americans take opioid prescription pain relievers for nonmedical uses. More than 400,000 Americans use heroin, a powerful opiate drug. Many people report misusing prescription opioids before starting to use heroin. Each year, more than 28,000 Americans die from opioid overdoses.
I believe the last answer is correct because this will enable you to measure in percentages the accuracy in order to decide when the accuracy increased.
