15. A researcher believes that students do better on a reading test when hearing a constant background sound. She divides a group of students into three random groups, has them read a passage (with...

Please graph the answer (Solve p =, z =, etc)

Extracted text: 15. A researcher believes that students do better on a reading test when hearing a constant background sound. She divides a group of students into three random groups, has them read a passage (with different background sounds), and then gives them a test. The following are her results: Constant Sound 7 6. 10 9. 8. Random Sound 8 7 2 4 1 No Sound 2 4 8 3 4 6. Can she say that there is a significant difference between any of the types of sounds?