## What is the index of difficulty?

The Difficulty Index is the proportion or probability that candidates, or students, will answer a test item correctly. Generally, more difficult items have a lower percentage, or P-value.

How do you find the difficulty index?

Determine the Difficulty Index by dividing the number who got it correct by the total number of students.

What is difficulty index in item analysis?

The item difficulty index is one of the most useful, and most frequently reported, item analysis statistics. It is a measure of the proportion of examinees who answered the item correctly; for this reason it is frequently called the p-value.

### What is a good item difficulty index?

The index is represented as a fraction and varies between -1 to 1. Optimally an item should have a positive discrimination index of at least 0.2, which indicates that high scorers have a high probability of answering correctly and low scorers have a low probability of answering correctly.

What is difficulty index in assessment?

Difficulty Index- Proportion of students who got an item correct. Count the number of students who got the correct answer. Divide by the total number of students who took the test. Difficulty Indices range from . 00 to 1.0.

What is Facility index?

The facility index of a test item is the percentage of a group of testees that chooses the correct response. This article describes the building up of a model of the curriculum in ‘O’ level Chemistry by which the four factors can be represented and a pilot study designed to test the feasibility of the model.

## What is the function of item difficulty to improve the test?

Item difficulty is relevant for determining whether students have learned the concept being tested. It also plays an important role in the ability of an item to discriminate between students who know the tested material and those who do not.

What does high discrimination index mean?

Discrimination Index – The discrimination index is a basic measure of the validity of an item. It is a measure of an item’s ability to discriminate between those who scored high on the total test and those who scored low.

How does difficulty index and discrimination index help you as a teacher?

The difficulty and discrimination indices are among the tools teachers can use to check whether the MCQs are well constructed or not. Another tool used for further analysis is the DE which analyses the quality of distractors. The distractors are analyzed to determine their relative usefulness in each item.

### What does a high discrimination index mean?

What is facility value?

Facility Value means the amount equivalent to the sum total of the amount of the Loan to Value.

What is effective distractor?

An effective distractor is one that attracts students with misconceptions or errors in thinking and reasoning, generally those with lower overall ability.

## How to calculate difficulty Index in the classroom?

The formula looks like this: the number of students who answer a question correctly (c) divided by the total number of students in the class who answered the question (s). The answer will equal a value between 0.0 and 1.0, with harder questions resulting in values closer to 0.0 and easier questions resulting in values closer to 1.0.

What is the purpose of item difficulty index?

The item difficulty index is a common and very useful analytical tool for statistical analysis, especially when it comes to determining the validity of test questions in an educational setting.

How are difficulty index and discrimination index calculated?

Determine the Difficulty Index by dividing the number who got it correct by the total number of students. For Question #1, this would be 8/10 or p=.80. Determine the Discrimination Index by subtracting the number of students in the lower group who got the item correct from the number of students in the upper group who got the item correct.

### How to calculate the difficulty of a question?

We can also compute the difficulty of the item by dividing the number of students who choose the correct answer (24) by the number of total students (30). Using this formula, the difficulty of Question #1 (referred to as p) is equal to 24/30 or .80.

What is the index of difficulty? The Difficulty Index is the proportion or probability that candidates, or students, will answer a test item correctly. Generally, more difficult items have a lower percentage, or P-value. How do you find the difficulty index? Determine the Difficulty Index by dividing the number who got it correct by the…