3 Guns in School. Researchers surveyed 15,624 Amercian high school stu- dents (grades 9-12) and found that 27.2% of those surveyed were in grade 9. The percent of all American high school students who are in grade 9 is 27.5%. The percent of those surveyed who were in grade 9 and had carried a gun to school was 4.5%. Is each of the boldface numbers a parameter or a statistic?