A high school English teacher measured the attitudes of 11th-grade students toward poetry. After a 9-week unit on poetry, she measured the students’ attitudes again. She was disappointed to find that...

Question: A high school English teacher measured the attitudes of 11th-grade students toward
poetry. After a 9-week unit on poetry, she measured the students’ attitudes again. She was
disappointed to find that the mean change was zero.
Following are some representative scores. (High scores represent more favorable attitudes.)
Calculate for both before and after scores, and write a conclusion based on the standard
deviations.
Before 7 5 3 5 5 4 5 6
After 9 8 2 1 8 9 1 2
Ans: The Tables below show the scores of the students before and after teaching and the
comparison between attitude toward poetry before and after a 9 week unit on poetry.
Before 7 5 3 5 5 4 5 6...