Explain which of the following is a statistic and which is a parameter.

1./ The mean age of Americans from the 2010 decennial census 2./ The unemployment rate for the population of U.S. adults, estimated by the government from a large sample 3./ The percentage of Texans opposed to the health care reform bill from a poll of 1,000 residents 4./ The mean salaries of employees at your school (e.g., administrators, faculty, maintenance)

5./ The percentage of students at your school who receive financial aid