What is discrimination index of a test item?

What is discrimination index of a test item?

Discrimination Index (Point Biserial): The discrimination index is a statistic which indicates the extent to which an item has discriminated between the high scorers and low scorers on the test. The index is represented as a fraction and varies between -1 to 1.

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.

What does a negative discrimination index mean?

When an item is discriminating negatively, overall the most knowledgeable examinees are getting the item wrong and the least knowledgeable examinees are getting the item right. A negative discrimination index may indicate that the item is measuring something other than what the rest of the test is measuring.

What does an item discrimination index of 0 tell you?

If an item has a discrimination index of 0, it indicates it is not discriminating at all – i.e. the same number of people in the higher group got it correct as in the lower group. Whether that is an issue will depend both on the type of item and what proportion of candidates overall got it correct (the mean).

How is item difficulty calculated?

Calculating Item Difficulty Count the total number of students answering each item correctly. For each item, divide the number answering correctly by the total number of students. This gives you the proportion of students who answered each item correctly. This figure is called the item’s difficulty level.

How do you determine whether the test item is ambiguous Miskey or a guessing item?

Miskeyed Item The test item is a potential miskey if there are more students from the upper group who choose the incorrect options than the key. Ambiguous item This happens when more students from the upper group choose equally an incorrect option and the keyed answer.

Why is analyzing an item necessary?

Item Analysis is an important (probably the most important) tool to increase test effectiveness. Each items contribution is analyzed and assessed. An item analysis provides three kinds of important information about the quality of test items. Item difficulty: A measure of whether an item was too easy or too hard.

What is the importance of analyzing the options in each item in a multiple choice test?

It is important to evaluate MCQ items to see how effective they are in assessing the knowledge of students. Postexamination analysis of the MCQs helps to assess the quality of individual test items and test as a whole. Poor items can be modified or removed from the store of questions.

What is a multiple-choice item?

A multiple-choice item consists of a stem, options, and auxiliary information. The stem contains context, content, and/or the question the student is required to answer. The options include a set of alternative answers with one correct option and one or more incorrect options or distractors.

What is one way to emotionally prepare for an exam?

When preparing for an exam, it is important to adjust your sleep to accommodate your studying needs. Most students who receive tutoring are successful in their courses. Emotional preparation for test-taking includes knowing the material, practicing how to relax, and using positive self-talk.

What are three advantages that multiple-choice items have over True False items?

Multiple-choice test items

• versatility in measuring all levels of cognitive ability.
• highly reliable test scores.
• scoring efficiency and accuracy.
• objective measurement of student achievement or ability.
• a wide sampling of content or objectives.
• a reduced guessing factor when compared to true-false items.

What is true/false test?

True-false tests contain statements that the student marks as being either true or false. In order to qualify as true, all parts of the statement must be true. In general, true-false tests check your knowledge of facts. Again, general study skills and best practices apply to studying for true-false tests.

How do you test for True-False?

True/False Test Taking Strategies

1. Approach each statement as if it were true.
2. For a sentence to be true, every part must be “true”.
3. Pay attention to “qualifiers”.
4. Don’t let “negatives” confuse you.
5. Watch for statements with double negatives.
6. Pay attention to “absolute” qualifiers.

What does don’t give a hint in the body of the question?

Here are some rules of thumb in constructing true-false items. Rule 1: Do not give a hint (inadvertently) in the body of the question. Example: The Philippines gained its independence in 1898 and therefore celebrated its centennial year in 2000.

What is the intention of a true/false question?

The purpose of the True/False Study Questions in the Gleim Online is to stimulate your memory and thinking. They are used to get you to start thinking about the information that you will study in the Knowledge Transfer Outline.