qu.x.y.mode=multiple selection@
qu.x.y.mode=non permuting multiple selection@
Multiple selection questions are similar to multiple choice items. However, they can require the user to identify more than one correct answer. You can create as many choices as you wish.
In multiple selection questions, the selections are permuted each time they appear. In non permuting multiple selection questions, the selection order is static.
By default, the system presents choices in a stacked, vertical list. If you wish to set choices horizontally, use the Inline Question type, and set your response object to multiple selection or non permuting multiple selection. See Inline Questions for more information.
The question is graded fully correct if the student chooses all the correct responses (and no incorrect responses). New to Version 2.5, the grader applies negative credit for selecting boxes that shouldn't be selected. The grading algorithm counts +1 for every time a student selects a choice that should be selected, and -1 for every time he or she selects a box that should not be selected. If the student's total score for the question is negative, then it is replaced by 0. The resulting score is then applied as a percentage of the total points that could be scored for the question (i.e. the total number of boxes that should be checked).
For example suppose that the correct answer is to check boxes (a) and (b), and to leave (c) and (d) unchecked. Then checking all four would score 0%, checking a,b,c would score 50%.
If the multiple selection question is included as a part of a multipart or inline question, the "question score" becomes the percentage score applied to the weighting defined for the question part that is the multiple selection question. Question part weighting is settable inside the question definition by the question author.
Summary
of Rules for Grading and Expected Grading Behavior
1. If the question has not been seen (i.e. completely unanswered) get 0
2. Suppose there are N choices. Make two lists side by side of the numbers
1,...,N, one for the student response and one for the correct response.
3. Run down each list, writing (X) beside a number that corresponds to
a choice that is selected and (O) beside a number that corresponds to
a choice that should not be selected.
4.Look down the two columns and count how many times an (X) matches with
an (X) or a (O) matches with an (O). Any
items that should have been selected (X) but were not count for 0. Any
items that should not have been selected (O) but were count for -1.
5. Give yourself 1 point for each correct choice that you selected. Deduct
1 point for each choice that you selected that should not be selected.
Total your points. That
total you just computed, divided by the total number of choices available
is your score (in percentage form).
6. This percentage score is then applied to the overall question weighting (number of points assigned to this question in the context of the overall assignment) to compute the total value of the score towards the overall assignment score. (Question weighting is defined by the instructor during assignment creation.)
See Also:
Algorithmic Multiple Selection Question Example Script
Creating Multiple Selection Questions in the QBE
Multiple Selection Question Example Script
Using Scripts to Create Multiple Selection Questions