The spreadsheet records the accuracy of 100 students spread out across 10 groups (or courses). ACCURACY is a measure of how well a student accurately inputs data into SAS; higher values indicate superior accuracy while lower values indicate inferior accuracy. GROUP is simply the course number assigned to the student—it is also known as a factor level. Various statistical tests assume the ten levels may have differing means of accuracy; however, they also assume that all levels have the same variance. But, how the heck do we know that? This means we must check to see whether all levels have the same variance. Do all ten groups exhibit equal variances? How do you know? Are any of the groups different than the others? How do you know? Perform Levene’s test and write it up.
The spreadsheet records the accuracy of 100 students spread out across 10 groups (or courses). ACCURACY is a measure of how well a student accurately inputs data into SAS; higher values indicate superior accuracy while lower values indicate inferior accuracy. GROUP is simply the course number assigned to the student—it is also known as a factor level.
Various statistical tests assume the ten levels may have differing means of accuracy; however, they also assume that all levels have the same variance. But, how the heck do we know that? This means we must check to see whether all levels have the same variance.
Do all ten groups exhibit equal variances? How do you know?
Are any of the groups different than the others? How do you know?
Perform Levene’s test and write it up.
Accuracy Group
1.0060 1
0.9960 1
0.9980 1
1.0000 1
0.9920 1
0.9930 1
1.0020 1
0.9990 1
0.9940 1
1.0000 1
0.9980 2
1.0060 2
1.0000 2
1.0020 2
0.9970 2
0.9980 2
0.9960 2
1.0000 2
1.0060 2
0.9880 2
0.9910 3
0.9870 3
0.9970 3
0.9990 3
0.9950 3
0.9940 3
1.0000 3
0.9990 3
0.9960 3
0.9960 3
1.0050 4
1.0020 4
0.9940 4
1.0000 4
0.9950 4
0.9940 4
0.9980 4
0.9960 4
1.0020 4
0.9960 4
0.9980 5
0.9980 5
0.9820 5
0.9900 5
1.0020 5
0.9840 5
0.9960 5
0.9930 5
0.9800 5
0.9960 5
1.0090 6
1.0130 6
1.0090 6
0.9970 6
0.9880 6
1.0020 6
0.9950 6
0.9980 6
0.9810 6
0.9960 6
0.9900 7
1.0040 7
0.9960 7
1.0010 7
0.9980 7
1.0000 7
1.0180 7
1.0100 7
0.9960 7
1.0020 7
0.9980 8
1.0000 8
1.0060 8
1.0000 8
1.0020 8
0.9960 8
0.9980 8
0.9960 8
1.0020 8
1.0060 8
1.0020 9
0.9980 9
0.9960 9
0.9950 9
0.9960 9
1.0040 9
1.0040 9
0.9980 9
0.9990 9
0.9910 9
0.9910 10
0.9950 10
0.9840 10
0.9940 10
0.9970 10
0.9970 10
0.9910 10
0.9980 10
1.0040 10
0.9970 10
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