Item Analysis Questions

In an exam, if a question is answered correctly by the top 27% of students but only by 4% of the bottom 27%, what is the approximate discrimination index of the item?

Scenario: In a biology class, the teacher designs a quiz about cellular respiration. One question asks about the final electron acceptor in the electron transport chain. Only a few students answer it correctly. What can be inferred about the difficulty index of this question?

Scenario: During a history exam, a question about the causes of the American Civil War is answered correctly by nearly all students. What does this suggest about the difficulty index of this question?

Scenario: In a physics class, the teacher creates a test with a question about projectile motion. Most students answer it correctly, with only a few struggling. What can be inferred about the difficulty index of this question?

Scenario: During a chemistry quiz, a question about the periodic trends of elements is answered correctly by only a handful of students. What does this suggest about the difficulty index of this question?

Scenario: In an English literature class, the teacher prepares a test with a question about analyzing Shakespearean sonnets. Most students find it challenging, with only a few managing to answer correctly. What can be inferred about the difficulty index of this question?

Scenario: In a math class, a teacher designs a test with a question about quadratic equations. The question is answered correctly by the top-performing students but frequently missed by the rest. What can be inferred about the discrimination index of this question?

Scenario: During a science exam, a question about genetics is answered correctly by both high and low-performing students alike. What does this suggest about the discrimination index of this question?

Scenario: In a history test, a question about the causes of World War II is consistently answered correctly by high-performing students but rarely by low-performing students. What can be inferred about the discrimination index of this question?

What does a stanine represent in educational assessment?