Parameter or statistic? Say whether each of the boldface numbers is a parameter or a statistic.

(a) Insured? A data set based on 168 hospital discharge summaries shows that 20% of patients were uninsured. (The review takes place in a large referral hospital.)

(b) Percent African American. Data from the complete enumeration of a standard metropolitan area (SMA) indicate that 12% of the inhabitants are African American. A telephone survey based on random-digit–dialing of individuals from this SMA found that 8% of the respondents were African American.

(c) Cost of antihypertensive medication. Data from 10 online pharmacies reveal that the average cost of a 1-month supply of a particular medication is $31.20 with standard deviation $7.75.

Data from 10 community pharmacies shows an average cost of

$33.18 with standard deviation $7.88.