For Exercises 58–64, state whether descriptive statistics or statistical inference was used, and explain why.
63. The Department of Health and Human Services conducted a survey, in which it was found that the percentage of 15- to 18-year-olds using illicit drugs has dropped in the last two years. The department concluded that illicit drug use has fallen among all 15- to 18-year-olds.
1.2.63
Inferential statistics; the sample was used to draw a conclusion about the entire population.