The U.S. Substance Abuse and Mental Health Services Administration collects and publishes data on nonmedical drug use, by type of drug and age group, in National Survey on Drug Use and Health. The following table provides data for the years 2003 and 2008. The percentages shown are estimates for the entire nation based on information obtained from a sample (NA, not available).

In Exercises, classify each of the studies as either descriptive or inferential. Explain your answers.

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Type of drug Any illicit drug Marijuana and hashish Cocaine Hallucinogens Inhalants Any psychotherapeutic Alcohol "Binge" alcohol use Cigarettes Smokeless tobacco Cigars Percentage, 18-25 years old Ever used Current user 2003 2008 2008 60.5 56.6 20.3 53.9 50.4 17.0 15.0 14.4 2.2 23.3 14.9 29.0 87.1 ΝΑ 70.2 22.0 45.2 17.7 10.4 29.2 85.6 ΝΑ 64.2 20.3 41.4 2003 1.7 0.4 6.0 61.4 41.6 40.2 4.7 11.4 19.6 16.5 1.5 1.7 0.3 5.9 61.2 41.8 35.7 5.4 11.3