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Question Statistics Report

Exam: SCAN 1A03 C01 Term 1
Instructor: EL SHAWWA N.
Date scanned: Wednesday September 08 2004
Each version is listed in order.
EXAM SUMMARY Raw
%
Maximum Score: 25.00
100.00
High Score: 19.00
76.00
Low Score: 9.00
36.00
Median: 16.00
64.00
Mean: 15.43
61.71
Standard Deviation: 2.71
10.86
Deleted questions:

Definitions

See the CIS OMR Website for more information.

Answers
This report shows statistics for the question as a whole and for answers A through E, as well as for the number of students who omitted the question. Answer A is also answer T or True, and answer B is also answer F or False.
Point value
Marks per answer as assigned by the instructor through the answer key or weighted file. The value under “Question” shows the maximum number of marks for that question, equivalent to the marks for the answer or answers with the highest mark. Part marks assigned to other answers are shown under the corresponding letter.
Response number
The number of students who responded to the question, and the number who chose each response (under the corresponding letter) or did not answer the question (“Omitted”).
Response index
The response number as a fraction of the total number of students taking the test, or for multi-version tests, this version of the test.
Point biserial
The point-biserial correlation index for the whole question is a statistical measure of the extent to which answering the question correctly corresponds to doing well on the test; it has values from -1 to 1. A point-biserial value close to 1 for the question indicates that students who answered this question correctly did well on the test. A value of close to zero says that there is little or no correspondence between the question and the test. A negative value shows that students who did well on the test did not do well on this question.
The point-biserial value for each answer indicates how well students did on the test who chose this answer. It will usually be a negative value for the wrong answers.
P(diff)
The p value or difficulty index is the ratio of students answering correctly to the total number of students taking the test, or for multi-version tests, this version of the test.

Question Statistics

Test version: 1
# Question A (T) B (F) C D E Omitted
1 Point value 1 0 0 0 1 0 0
Response number 35 0 0 1 30 4 0
Response index 0.000 0.000 0.029 0.857 0.114 0.000
Point biserial 0.096 – – 0.165 0.096 -0.192 –
P(diff) 0.857
2 Point value 1 0 0 1 0 0 0
Response number 35 10 1 23 0 1 0
Response index 0.286 0.029 0.657 0.000 0.029 0.000
Point biserial 0.183 -0.149 -0.284 0.183 – 0.165 –
P(diff) 0.657
3 Point value 1 0 0 0 0 1 0
Response number 35 5 0 6 1 23 0
Response index 0.143 0.000 0.171 0.029 0.657 0.000
Point biserial 0.071 -0.035 – -0.045 -0.027 0.071 –
P(diff) 0.657
4 Point value 1 0 0 0 1 0 0
Response number 35 3 0 0 31 1 0
Response index 0.086 0.000 0.000 0.886 0.029 0.000
Point biserial 0.360 -0.392 – – 0.360 -0.027 –
P(diff) 0.886
5 Point value 1 0 0 0 0 1 0
Response number 35 1 0 0 9 25 0
Response index 0.029 0.000 0.000 0.257 0.714 0.000
Point biserial 0.149 0.101 – – -0.192 0.149 –
P(diff) 0.714
6 Point value 1 0 1 0 0 0 0
Response number 35 2 31 1 1 0 0
Response index 0.057 0.886 0.029 0.029 0.000 0.000
Point biserial 0.091 -0.131 0.091 -0.092 0.101 – –
P(diff) 0.886
7 Point value 1 0 0 0 1 0 0
Response number 35 1 16 6 4 8 0
Response index 0.029 0.457 0.171 0.114 0.229 0.000
Point biserial -0.192 -0.027 0.303 -0.073 -0.192 -0.138 –
P(diff) 0.114
8 Point value 1 0 1 0 0 0 0
Response number 35 2 3 1 11 18 0
Response index 0.057 0.086 0.029 0.314 0.514 0.000
Point biserial 0.065 0.099 0.065 0.037 -0.039 -0.058 –
P(diff) 0.086
9 Point value 1 1 0 0 0 0 0
Response number 35 25 2 2 6 0 0
Response index 0.714 0.057 0.057 0.171 0.000 0.000
Point biserial 0.409 0.409 0.007 -0.223 -0.356 – –
P(diff) 0.714
10 Point value 1 0 0 0 1 0 0
Response number 35 1 0 9 15 10 0
Response index 0.029 0.000 0.257 0.429 0.286 0.000
Point biserial -0.031 -0.092 – -0.119 -0.031 0.182 –
P(diff) 0.429
11 Point value 1 0 0 0 0 1 0
Response number 35 14 2 2 8 9 0
Response index 0.400 0.057 0.057 0.229 0.257 0.000
Point biserial 0.175 0.087 0.007 -0.039 -0.265 0.175 –
P(diff) 0.257
12 Point value 1 0 0 0 0 1 0
Response number 35 0 0 2 3 30 0
Response index 0.000 0.000 0.057 0.086 0.857 0.000
Point biserial 0.310 – – -0.177 -0.240 0.310 –
P(diff) 0.857
13 Point value 1 0 0 1 0 0 0
Response number 35 1 11 23 0 0 0
Response index 0.029 0.314 0.657 0.000 0.000 0.000
Point biserial 0.588 -0.220 -0.522 0.588 – – –
P(diff) 0.657
14 Point value 1 0 1 0 0 0 0
Response number 35 14 19 1 0 1 0
Response index 0.400 0.543 0.029 0.000 0.029 0.000
Point biserial 0.297 -0.371 0.297 0.037 – 0.165 –
P(diff) 0.543
15 Point value 1 0 0 0 1 0 0
Response number 35 0 4 0 31 0 0
Response index 0.000 0.114 0.000 0.886 0.000 0.000
Point biserial 0.158 – -0.158 – 0.158 – –
P(diff) 0.886
16 Point value 1 1 0 0 0 0 0
Response number 35 31 1 0 2 1 0
Response index 0.886 0.029 0.000 0.057 0.029 0.000
Point biserial 0.561 0.561 -0.220 – -0.315 -0.412 –
P(diff) 0.886
17 Point value 1 0 0 1 0 0 0
Response number 35 0 6 21 0 8 0
Response index 0.000 0.171 0.600 0.000 0.229 0.000
Point biserial 0.262 – -0.016 0.262 – -0.291 –
P(diff) 0.600
18 Point value 1 0 0 0 1 0 0
Response number 35 2 2 1 30 0 0
Response index 0.057 0.057 0.029 0.857 0.000 0.000
Point biserial 0.462 -0.269 -0.269 -0.220 0.462 – –
P(diff) 0.857
19 Point value 1 1 0 0 0 0 0
Response number 35 30 0 1 2 2 0
Response index 0.857 0.000 0.029 0.057 0.057 0.000
Point biserial 0.371 0.371 – -0.220 -0.131 -0.269 –
P(diff) 0.857
20 Point value 1 0 0 0 0 1 0
Response number 35 0 2 1 3 29 0
Response index 0.000 0.057 0.029 0.086 0.829 0.000
Point biserial 0.441 – -0.315 -0.284 -0.163 0.441 –
P(diff) 0.829
21 Point value 1 0 1 0 0 0 0
Response number 28 22 6 0 0 0 7
Response index 0.629 0.171 0.000 0.000 0.000 0.200
Point biserial 0.154 0.344 0.154 – – – -0.561
P(diff) 0.171
22 Point value 1 1 0 0 0 0 0
Response number 28 7 21 0 0 0 7
Response index 0.200 0.600 0.000 0.000 0.000 0.200
Point biserial 0.294 0.294 0.218 – – – -0.561
P(diff) 0.200
23 Point value 1 1 0 0 0 0 0
Response number 28 27 1 0 0 0 7
Response index 0.771 0.029 0.000 0.000 0.000 0.200
Point biserial 0.494 0.494 0.101 – – – -0.561
P(diff) 0.771
24 Point value 1 1 0 0 0 0 0
Response number 28 12 16 0 0 0 7
Response index 0.343 0.457 0.000 0.000 0.000 0.200
Point biserial 0.424 0.424 0.046 – – – -0.561
P(diff) 0.343
25 Point value 1 0 1 0 0 0 0
Response number 28 3 25 0 0 0 7
Response index 0.086 0.714 0.000 0.000 0.000 0.200
Point biserial 0.385 0.180 0.385 – – – -0.561
P(diff) 0.714