Statistics tracking can be added to most content in Blackboard. If you turn on statistics tracking, you will be able to see how many times each student has access the content on any day and get a break down of when the content is being accessed.
How to Run an Item Analysis on a Test:Go to one of the previously listed locations to access item analysis (see above).Access the test's contextual menu from the downward facing chevron on its right.Select Item Analysis.In the Select Test drop down list, select a test. ... Click Run.More items...
A negative point biserial indicates low scoring students on the total test did better on a test item than high-scoring students. As a general rule, a point biserial of ≥. 20 is desirable.
The interpretation of High-Low Discrimination is similar to the interpretation of correlational indices: positive values indicate good discrimination, values near zero indicate that there is little discrimination, and negative discrimination indicates that the item is easier for low-scoring participants.
Discrimination: Indicates how well a question differentiates between students who know the subject matter and those who don't. A question is a good discriminator when students who answer the question correctly also do well on the test. Values can range from -1.0 to +1.0.
Item analysis is a process which examines student responses to individual test items (questions) in order to assess the quality of those items and of the test as a whole.
A point-biserial correlation is used to measure the strength and direction of the association that exists between one continuous variable and one dichotomous variable.
Like all Correlation Coefficients (e.g. Pearson's r, Spearman's rho), the Point-Biserial Correlation Coefficient measures the strength of association of two variables in a single measure ranging from -1 to +1, where -1 indicates a perfect negative association, +1 indicates a perfect positive association and 0 indicates ...
Interpreting Biserial Correlation ScoresA high percentage of students scoring a correct answer, paired with a biserial correlation greater than +. ... A low percentage of students scoring a correct answer, paired with a biserial correlation greater than+.More items...
If the intent is a mastery item, a difficulty level between 0.80 and 1.00 is acceptable. If the intent is a discriminating question, a range of 0.30 to 0.70 is generally acceptable. Discrimination index – This value is based on the top 27% and bottom 27% of the class on the exam.
The discrimination index (DI) measures how discriminating items in an exam are – i.e. how well an item can differentiate between good candidates and less able ones. For each item it is a measure based on the comparison of performance between stronger and weaker candidates in the exam as a whole.
The discrimination index can be described as the possibility that a specific item might distinguish or discriminate between students who possess the necessary knowledge to answer the question correctly, and others who lack such knowledge.