7. In a statistics class, a teacher is interested in seeing if merely having students sign in everyday in class will increase attendance. Over many prior semesters of statistics teaching, it has been...

Extracted text: 7. In a statistics class, a teacher is interested in seeing if merely having students sign in everyday in class will increase attendance. Over many prior semesters of statistics teaching, it has been found that the average number of classes students attend is u = 24 of 30 during the semester with G = 12. One semester the teacher institutes a sign-in sheet on which students sign in each day. At the end of the semester, in a classroom of n = 49 students, the students have attended an average of M = 28 classes. Test the hypothesis that the use of the sign-in sheet improved attendance. Be sure to give all the steps outlined above. Use a = .05. 8. Go back to problem 7. Now assume that the teacher makes no prediction about whether the sign- up sheet will increase or decrease attendance. Use all the information from problem 7; be sure to give all the steps in the outline above, and test this non-directional hypothesis that use of the sign- in sheet will change attendance. Use a = .05.