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ITEM ANALYSIS

ITEM ANALYSIS. Purpose of Item Analysis. The process of examining the student’s responses to each item. The need to look into the difficulty and discriminating ability of the item as well as the effectiveness of the each alternative. Item Analysis.

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ITEM ANALYSIS

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  1. ITEM ANALYSIS

  2. Purpose of Item Analysis • The process of examining the student’s responses to each item. • The need to look into the difficulty and discriminating ability of the item as well as the effectiveness of the each alternative.

  3. Item Analysis Difficulty Index – the percentage of the student who got the item right. Can also be interpreted as how easy or how difficult an item is. Discrimination index – separates the bright students from the challenge ones.

  4. Item Analysis • When we prepare test items we aim to have average difficulty • Item Analysis will help us in selecting the items that are of average difficulty.

  5. Item Difficulty = number of students with correct answer/ total number of students Example: What is the item difficulty index of an item if 25 students are unable to answer it correctly while 75 answered it correctly? Item Difficulty = 75/100 = .75 or 75%

  6. U-L Index Method (Santos, 2007) • Table of equivalents in interpreting the difficulty index Range of Difficulty Index Interpretation Action .00 to .25 Difficult Revise or discard .26 to .75 Right Difficulty Retain .76 & above Easy Revise or discard

  7. Index of discrimination Difficulty Index = no. of students getting correct response/total = 40/100 = .40 or 40% within range of a good item DU=no. of students in upper 25% with correct response/no of students in the upper 25% = 15/20 = .75 or 75% DL=no. of students in lower 25% with correct response/no of students in the lower 25% = 5/20 = .25 or 25% Discrimination Index = DU-DL =.75-.25= .50 has a good discriminating power

  8. U-L Index Method (Stocklein, 1957) • Table of equivalents in interpreting the difficulty index .00 to .20 – Very Difficult .21 to .80 – Moderately Difficult .81 to 1.00 – Very Easy

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