Which of the given is an example of a matched pairs design? group of answer choices a teacher compares the pre‑test and post‑test scores of students. a teacher compares the scores of students who had a computer‑based method of instruction with the scores of other students who had a traditional method of instruction. a teacher compares the scores of students in her class on a standardized test with the national average score. a teacher calculates the average of students' scores on a pair of tests and wishes to see if this average is larger than 80%.