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20. In a national survey on substance abuse, 10.0% of respondents aged 12 to 17 reported using illicit drugs within the past month. In actuality, 11.1% of all persons in the United States aged 12 to 17 have used illicit drugs within the past month. (1.5 pts) a. 11.1% is a parameter and 10.0% is a statistic. b. 10.0% is a parameter and 11.1% is a statistic. c. both 10.0% and 11.1% are parameters. d. both 10.0% and 11.1% are statistics