Understanding the Main Analysis Screen
The Analysis screen is broken down into three sections:
Summary Info—Provides statistics related to students’ grades and the speed with which they completed the assignment.
Charts—Displays a few snapshots related to students’ grades and the difficulty of the assignment’s questions.
Item Analysis—Offers detailed analysis on the difficulty of each question.
The Summary Info area of the screen displays the data described in the following bullets:
Total Students—The total number of students who completed the assignment and received a score that was above zero.
Average Time Used—The average length of time used by students to complete the assignment (based on students who scored above zero).
Fastest Time—The fastest time a student used to complete the assignment. If the fastest score was achieved by only one student, the system includes a link to the Student Assignment Detail screen for that student.
Slowest Time—The slowest time a student used to complete the assignment. If the slowest score was achieved by only one student, the system includes a link to the Student Assignment Detail screen for that student.
Average Score—The average score, displayed both in percentage and in point form.
Median Score—The score that is midway among all scores achieved. That is, the score for which there is an equal number of scores above and below. If there are an equal number of scores, then the median is the average of the two middle values.
Mode—The score(s) that were most frequently achieved.
High Score—The highest score. If the high score was achieved by only one student, the system includes a link to the Student Assignment Detail screen for that student.
Low Score—The lowest score. If the low score was achieved by only one student, the system includes a link to the Student Assignment Detail screen for that student.
Score Distribution—A graphic showing all scores for the assignment, along with the number of students who achieved each score.
The Charts area of the screen displays three types of charts:
Letter Grade Distribution—Shows the number of students who received each letter grade. The system assigns letter grades using the values you set up in the Gradebook. For details, refer to the Letter Grade Configuration section.
Question Difficulty Distribution—Shows the number of questions in each difficulty range.
Average Score by Performance Group—Shows the average score for each of the three performance groups.
The Item Analysis area of the screen analyzes the difficulty and discrimination index for the entire assignment, with details about each question. This section is divided into the following parts:
Overall
Grid View
Question by Question
The overall section displays the following information:
The average difficulty rating for the assignment overall.
The average discrimination index for the assignment overall.
A link to the page on which you can configure the size of the performance groups for the course section.
The Grid View area of the Item Analysis section offers a summary of the key statistics on each question. For each question, it displays the following values:
Difficulty—The question’s difficulty rating.
Discrimination Index—The question’s discrimination index.
Average Score—The average score achieved by students on the question.
If appropriate, the system displays a warning icon in this area. The warning icon is displayed if a question’s difficulty, or some other parameter, exceeded the minimal level you configured for the course section. (For details on these levels, see Setting Preferences for the Course Section.)
The Question by Question offers more in-depth analysis. In this view, the system presents the full text of each question alongside a more detailed set of statistics. By default, some of the details are collapsed, but you can expand them by clicking the blue plus-sign icons.