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Question Statistics Report (Multiple Versions)

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: 26.00
100.00
High Score: 20.00
76.92
Low Score: 10.00
38.46
Median: 17.00
65.38
Mean: 16.43
63.19
Standard Deviation: 2.71
10.44
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 1 0 0 0 0 0
Response number 18 18 0 0 0 0 0
Response index 1.000 0.000 0.000 0.000 0.000 0.000
Point biserial – – – – – – –
P(diff) 1.000
2 Point value 1 0 0 0 1 0 0
Response number 18 0 0 1 15 2 0
Response index 0.000 0.000 0.056 0.833 0.111 0.000
Point biserial 0.541 – – 0.236 0.541 -0.325 –
P(diff) 0.833
3 Point value 1 0 0 1 0 0 0
Response number 18 2 0 15 0 1 0
Response index 0.111 0.000 0.833 0.000 0.056 0.000
Point biserial 0.484 -0.258 – 0.484 – 0.236 –
P(diff) 0.833
4 Point value 1 0 0 0 0 1 0
Response number 18 3 0 2 1 12 0
Response index 0.167 0.000 0.111 0.056 0.667 0.000
Point biserial 0.083 0.097 – 0.278 -0.039 0.083 –
P(diff) 0.667
5 Point value 1 0 0 0 1 0 0
Response number 18 1 0 0 16 1 0
Response index 0.056 0.000 0.000 0.889 0.056 0.000
Point biserial 0.814 -0.407 – – 0.814 -0.039 –
P(diff) 0.889
6 Point value 1 0 0 0 0 1 0
Response number 18 1 0 0 5 12 0
Response index 0.056 0.000 0.000 0.278 0.667 0.000
Point biserial 0.351 0.144 – – -0.101 0.351 –
P(diff) 0.667
7 Point value 1 0 1 0 0 0 0
Response number 18 1 15 1 1 0 0
Response index 0.056 0.833 0.056 0.056 0.000 0.000
Point biserial 0.315 0.144 0.315 -0.131 0.144 – –
P(diff) 0.833
8 Point value 1 0 0 0 1 0 0
Response number 18 1 9 1 2 5 0
Response index 0.056 0.500 0.056 0.111 0.278 0.000
Point biserial -0.325 -0.039 0.343 0.236 -0.325 0.087 –
P(diff) 0.111
9 Point value 1 0 1 0 0 0 0
Response number 18 1 2 0 3 12 0
Response index 0.056 0.111 0.000 0.167 0.667 0.000
Point biserial 0.345 0.236 0.345 – -0.186 0.128 –
P(diff) 0.111
10 Point value 1 1 0 0 0 0 0
Response number 18 15 1 0 2 0 0
Response index 0.833 0.056 0.000 0.111 0.000 0.000
Point biserial 0.993 0.993 -0.039 – -0.660 – –
P(diff) 0.833
11 Point value 1 0 0 0 1 0 0
Response number 18 0 0 7 7 4 0
Response index 0.000 0.000 0.389 0.389 0.222 0.000
Point biserial 0.389 – – -0.173 0.389 0.116 –
P(diff) 0.389
12 Point value 1 0 0 0 0 1 0
Response number 18 6 1 0 5 6 0
Response index 0.333 0.056 0.000 0.278 0.333 0.000
Point biserial 0.377 0.421 0.236 – -0.618 0.377 –
P(diff) 0.333
13 Point value 1 0 0 0 0 1 0
Response number 18 0 0 1 3 14 0
Response index 0.000 0.000 0.056 0.167 0.778 0.000
Point biserial 0.912 – – -0.407 -0.355 0.912 –
P(diff) 0.778
14 Point value 1 0 0 1 0 0 0
Response number 18 0 3 15 0 0 0
Response index 0.000 0.167 0.833 0.000 0.000 0.000
Point biserial 0.654 – -0.242 0.654 – – –
P(diff) 0.833
15 Point value 1 0 1 0 0 0 0
Response number 18 7 11 0 0 0 0
Response index 0.389 0.611 0.000 0.000 0.000 0.000
Point biserial 0.660 -0.346 0.660 – – – –
P(diff) 0.611
16 Point value 1 0 0 0 1 0 0
Response number 18 0 2 0 16 0 0
Response index 0.000 0.111 0.000 0.889 0.000 0.000
Point biserial 0.412 – 0.077 – 0.412 – –
P(diff) 0.889
17 Point value 1 1 0 0 0 0 0
Response number 18 15 0 0 2 1 0
Response index 0.833 0.000 0.000 0.111 0.056 0.000
Point biserial 1.162 1.162 – – -0.459 -0.591 –
P(diff) 0.833
18 Point value 1 0 0 1 0 0 0
Response number 18 0 3 10 0 5 0
Response index 0.000 0.167 0.556 0.000 0.278 0.000
Point biserial 0.751 – -0.299 0.751 – -0.242 –
P(diff) 0.556
19 Point value 1 0 0 0 1 0 0
Response number 18 0 0 1 17 0 0
Response index 0.000 0.000 0.056 0.944 0.000 0.000
Point biserial 0.985 – – -0.315 0.985 – –
P(diff) 0.944
20 Point value 1 1 0 0 0 0 0
Response number 18 16 0 0 0 2 0
Response index 0.889 0.000 0.000 0.000 0.111 0.000
Point biserial 0.881 0.881 – – – -0.392 –
P(diff) 0.889
21 Point value 1 0 0 0 0 1 0
Response number 18 0 1 1 2 14 0
Response index 0.000 0.056 0.056 0.111 0.778 0.000
Point biserial 0.760 – -0.315 -0.407 0.010 0.760 –
P(diff) 0.778
22 Point value 1 0 1 0 0 0 0
Response number 15 14 1 0 0 0 3
Response index 0.778 0.056 0.000 0.000 0.000 0.167
Point biserial 0.236 0.709 0.236 – – – -0.525
P(diff) 0.056
23 Point value 1 1 0 0 0 0 0
Response number 15 4 11 0 0 0 3
Response index 0.222 0.611 0.000 0.000 0.000 0.167
Point biserial 0.268 0.268 0.487 – – – -0.525
P(diff) 0.222
24 Point value 1 1 0 0 0 0 0
Response number 15 15 0 0 0 0 3
Response index 0.833 0.000 0.000 0.000 0.000 0.167
Point biserial 0.936 0.936 – – – – -0.525
P(diff) 0.833
25 Point value 1 1 0 0 0 0 0
Response number 15 8 7 0 0 0 3
Response index 0.444 0.389 0.000 0.000 0.000 0.167
Point biserial 0.618 0.618 0.086 – – – -0.525
P(diff) 0.444
26 Point value 1 0 1 0 0 0 0
Response number 15 3 12 0 0 0 3
Response index 0.167 0.667 0.000 0.000 0.000 0.167
Point biserial 0.530 0.266 0.530 – – – -0.525
P(diff) 0.667

 

Test version: 2
# Question A (T) B (F) C D E Omitted
1 Point value 1 0 1 0 0 0 0
Response number 17 0 17 0 0 0 0
Response index 0.000 1.000 0.000 0.000 0.000 0.000
Point biserial – – – – – – –
P(diff) 1.000
2 Point value 1 0 0 0 1 0 0
Response number 17 0 0 0 15 2 0
Response index 0.000 0.000 0.000 0.882 0.118 0.000
Point biserial -0.446 – – – -0.446 -0.059 –
P(diff) 0.882
3 Point value 1 0 0 1 0 0 0
Response number 17 8 1 8 0 0 0
Response index 0.471 0.059 0.471 0.000 0.000 0.000
Point biserial -0.019 -0.109 -0.420 -0.019 – – –
P(diff) 0.471
4 Point value 1 0 0 0 0 1 0
Response number 17 2 0 4 0 11 0
Response index 0.118 0.000 0.235 0.000 0.647 0.000
Point biserial 0.060 -0.198 – -0.301 – 0.060 –
P(diff) 0.647
5 Point value 1 0 0 0 1 0 0
Response number 17 2 0 0 15 0 0
Response index 0.118 0.000 0.000 0.882 0.000 0.000
Point biserial -0.099 -0.406 – – -0.099 – –
P(diff) 0.882
6 Point value 1 0 0 0 0 1 0
Response number 17 0 0 0 4 13 0
Response index 0.000 0.000 0.000 0.235 0.765 0.000
Point biserial -0.083 – – – -0.301 -0.083 –
P(diff) 0.765
7 Point value 1 0 1 0 0 0 0
Response number 17 1 16 0 0 0 0
Response index 0.059 0.941 0.000 0.000 0.000 0.000
Point biserial -0.271 -0.420 -0.271 – – – –
P(diff) 0.941
8 Point value 1 0 0 0 1 0 0
Response number 17 0 7 5 2 3 0
Response index 0.000 0.412 0.294 0.118 0.176 0.000
Point biserial -0.059 – 0.272 -0.252 -0.059 -0.427 –
P(diff) 0.118
9 Point value 1 0 1 0 0 0 0
Response number 17 1 1 1 8 6 0
Response index 0.059 0.059 0.059 0.471 0.353 0.000
Point biserial -0.325 -0.041 -0.325 0.054 0.070 -0.260 –
P(diff) 0.059
10 Point value 1 1 0 0 0 0 0
Response number 17 10 1 2 4 0 0
Response index 0.588 0.059 0.118 0.235 0.000 0.000
Point biserial -0.013 -0.013 0.054 -0.337 -0.143 – –
P(diff) 0.588
11 Point value 1 0 0 0 1 0 0
Response number 17 1 0 2 8 6 0
Response index 0.059 0.000 0.118 0.471 0.353 0.000
Point biserial -0.467 -0.136 – -0.059 -0.467 0.254 –
P(diff) 0.471
12 Point value 1 0 0 0 0 1 0
Response number 17 8 1 2 3 3 0
Response index 0.471 0.059 0.118 0.176 0.176 0.000
Point biserial -0.075 -0.243 -0.231 -0.059 0.159 -0.075 –
P(diff) 0.176
13 Point value 1 0 0 0 0 1 0
Response number 17 0 0 1 0 16 0
Response index 0.000 0.000 0.059 0.000 0.941 0.000
Point biserial -0.746 – – 0.054 – -0.746 –
P(diff) 0.941
14 Point value 1 0 0 1 0 0 0
Response number 17 1 8 8 0 0 0
Response index 0.059 0.471 0.471 0.000 0.000 0.000
Point biserial 0.652 -0.325 -0.825 0.652 – – –
P(diff) 0.471
15 Point value 1 0 1 0 0 0 0
Response number 17 7 8 1 0 1 0
Response index 0.412 0.471 0.059 0.000 0.059 0.000
Point biserial -0.064 -0.408 -0.064 0.054 – 0.244 –
P(diff) 0.471
16 Point value 1 0 0 0 1 0 0
Response number 17 0 2 0 15 0 0
Response index 0.000 0.118 0.000 0.882 0.000 0.000
Point biserial -0.099 – -0.406 – -0.099 – –
P(diff) 0.882
17 Point value 1 1 0 0 0 0 0
Response number 17 16 1 0 0 0 0
Response index 0.941 0.059 0.000 0.000 0.000 0.000
Point biserial -0.366 -0.366 -0.325 – – – –
P(diff) 0.941
18 Point value 1 0 0 1 0 0 0
Response number 17 0 3 11 0 3 0
Response index 0.000 0.176 0.647 0.000 0.176 0.000
Point biserial -0.267 – 0.276 -0.267 – -0.368 –
P(diff) 0.647
19 Point value 1 0 0 0 1 0 0
Response number 17 2 2 0 13 0 0
Response index 0.118 0.118 0.000 0.765 0.000 0.000
Point biserial 0.233 -0.406 -0.406 – 0.233 – –
P(diff) 0.765
20 Point value 1 1 0 0 0 0 0
Response number 17 14 0 1 2 0 0
Response index 0.824 0.000 0.059 0.118 0.000 0.000
Point biserial -0.059 -0.059 – -0.325 -0.198 – –
P(diff) 0.824
21 Point value 1 0 0 0 0 1 0
Response number 17 0 1 0 1 15 0
Response index 0.000 0.059 0.000 0.059 0.882 0.000
Point biserial 0.040 – -0.325 – -0.420 0.040 –
P(diff) 0.882
22 Point value 1 0 1 0 0 0 0
Response number 13 8 5 0 0 0 4
Response index 0.471 0.294 0.000 0.000 0.000 0.235
Point biserial 0.140 0.070 0.140 – – – -0.617
P(diff) 0.294
23 Point value 1 1 0 0 0 0 0
Response number 13 3 10 0 0 0 4
Response index 0.176 0.588 0.000 0.000 0.000 0.235
Point biserial 0.335 0.335 -0.058 – – – -0.617
P(diff) 0.176
24 Point value 1 1 0 0 0 0 0
Response number 13 12 1 0 0 0 4
Response index 0.706 0.059 0.000 0.000 0.000 0.235
Point biserial 0.140 0.140 0.149 – – – -0.617
P(diff) 0.706
25 Point value 1 1 0 0 0 0 0
Response number 13 4 9 0 0 0 4
Response index 0.235 0.529 0.000 0.000 0.000 0.235
Point biserial 0.226 0.226 0.006 – – – -0.617
P(diff) 0.235
26 Point value 1 0 1 0 0 0 0
Response number 13 0 13 0 0 0 4
Response index 0.000 0.765 0.000 0.000 0.000 0.235
Point biserial 0.233 – 0.233 – – – -0.617
P(diff) 0.765