1. (15+1 for Excel work) Grading assignments is a real problem, taking a great deal of time and while many students do a poor job, many copy and gain no benefit. An instructor who taught three sections of a course carried out a test. One section had no assignments, one had assignments but they were not graded, and the final section had graded assignments. Grades were reviewed after the first midterm. Assume each population is normally distributed, and samples are independent random samples. Using EXCEL where possible perform ALL ANOVA tests necessary to determine which approach if any led to higher grades. Use alpha = 0.05 in all tests. Use EXCEL for the ANOVA test and use the p values in testing. For those tests for which you cannot use EXCEL, use the standard write up as used in the practice assignments.

1. (15+1 for Excel work) Grading assignments is a real problem, taking a great deal of time
and while many students do a poor job, many copy and gain no benefit. An instructor
who taught three sections of a course carried out a test. One section had no
assignments, one had assignments but they were not graded, and the final section had
graded assignments. Grades were reviewed after the first midterm. Assume each
population is normally distributed, and samples are independent random samples.
Using EXCEL where possible perform ALL ANOVA tests necessary to determine which
approach if any led to higher grades. Use alpha = 0.05 in all tests. Use EXCEL for the
ANOVA test and use the p values in testing. For those tests for which you cannot use
EXCEL, use the standard write up as used in the practice assignments.
No Assignments
69
69
92
84
79
84
76
63
76
82
89
72
72
65
73
47
92
71
83
81
92
80
64
72
84
79
74
81

Assignments, Not Graded
73
63
68
79
57
68
72
74
49
84
79
71
80
74
71
63
88
83
89
82
69
92
79
81
76
81
81
75

Assignments, Graded
83
97
72
79
84
76
91
76
83
88
91
96
68
99
89
80
79
91
83
83
76
90
79
67
86
86
82
84