47. In the 1980s, the Tennessee Student Teacher Achievement Ratio experiment randomly assigned more than 7000 children to regular or small classes during their first four years of school. Even though the treatment lasted only from kindergarten to third grade, there were differences (in favor of the students in the smaller classes) that were noticeable even many years later. For example, when these same children reached high school, 40.2% of Black students from the small classes took the ACT or SAT college entrance exam. Only 31.7% of Black students from the regular classes took one of these exams. For each underlined number, state whether it is a parameter or a statistic.