module 6 presentation
TRANSCRIPT
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• At the end of the semester, the students will be able to know the following:
The procedures in Item Analysis
Computation for the Index of Difficulty and Index of Discrimination
Interpreting the Test Scores
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• 3 Criteria Determining the Desirability of an Item:
• 1. Difficulty of an Item. ( How difficult the item is.)
• 2. Discriminating power of an item (+/-)
• *positive disc= Pu > PL
• 3. Measure of Attractiveness (+/-)
• (Determines how attractive is the distractor)
• *keyed response=correct answer
• *wrong options= distractor
• *effective distracters= more students in lower group chose it than the upper group.
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2.Arrange the scores from highest to lowest.
3.Separate the top 27% and the bottom 27%
4.Find the proportion of each score. (frequency/the 27%)
Then solve for this:
*Index of Difficulty: *Index of Discrimination:
Df= (Pu+PL)/2 Ds= Pu-PL
*Measure of Attractiveness *where:
Da= Pu-PL/St Pu= upper class
PL=lower class
St= number of students
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• Discriminating Index
• .40-up= very good item(accept)
• .30-.29= reasonably good item but subject for revision
• .20-.29= marginal item (revise)
• Below-.19= poor item (reject)
• Range of Difficulty
• 0.00-0.20 – Very difficult
• 0.21-0.40 – Difficult
• 0.41-0.60 – Moderately difficult
• 0.61-0.80 – Easy
• 0.81-1.00 – Very easy
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