edu533

• What is item analysis?

  Item analysis is a statistical technique used for selecting and rejecting test items based on their difficulty value and discriminative power.
• What are the objectives of item analysis?

  • To select appropriate items for the final draft
  • To obtain information about the difficulty value (D.V) of all items
  • To provide modifications to some items
  • To provide discriminatory power (D.I) to differentiate between capable and less capable examinees
  • To prepare the final draft properly (from easy to difficult items)
• What are the steps involved in item analysis?

  1. Arrange the test scores from highest to lowest.
  2. Include only the upper 27% and lower 27% of the total number in the analysis.
  3. Do not include the middle part of the test takers.
  4. Compute the difficulty index.
  5. Compute the discrimination index.
  6. Decide whether the item will be eliminated.
  7. Decide if the distracter should be eliminated.
• How do you determine how many students will be included in item analysis for an 80-student class?

  27% of 80 students equals 22 students for both the upper and lower groups.
• What is the purpose of the difficulty index in item analysis?

  The difficulty index measures how easy or difficult an item was.
• What does the discrimination index indicate in item analysis?

  The discrimination index indicates how well an item can distinguish between high ability and low ability students.
• What is the distracter index in item analysis?

  The distracter index indicates that the incorrect option should attract more of the lower group than the upper group.
• Given the options A, B, C, D with totals for the upper and lower groups, how do you compute the difficulty index?

  The difficulty index is computed by analyzing the number of correct responses from both groups.
• If the difficulty index is 0.64, what does this indicate about the item?

  A difficulty index of 0.64 indicates that the item is average and should be retained.
• How are the upper and lower groups determined in item analysis?

  • The upper group consists of the top 27% of test scores.
  • The lower group consists of the bottom 27% of test scores.
  • For an 80-student class, each group would have approximately 22 students.