3.) Answer the questions about the following statistical studies. Study #1: Mr. Roberts teaches Economics, and he is very concerned with his students' test scores. He wants to know if guided notes improve test grades as compared to copying down all the notes from the board. He decides to give guided notes to his 3rd period, regular notes to his 5th period, and no notes to his 6th period. He then compared the results of the class' test averages