Answer :
True, an item discrimination index greater than 0.30 is often considered adequate, showing that the test question can differentiate between students of varying ability levels. So, the statement is true.
An item discrimination index of 0.3 or greater is typically considered adequate. This index measures how well an item differentiates between high and low performers on a test. Higher discrimination indexes indicate that the item is effective in distinguishing between students with different levels of knowledge or ability.
For example, if an item discrimination index is 0.3, it means that the item is moderately effective in discriminating between students who perform well and those who do not on the test. It shows that the item is fair and useful in assessing student knowledge.The item discrimination index greater than 0.30 is adequate can be considered true in many testing scenarios.
The item discrimination index is a measure of how well a test question differentiates between students who perform well on the overall test and those who do not. Although the ideal range is often considered to be between 0.4 and 0.7, an index value over 0.30 is typically deemed acceptable and indicates that the item is adequately discerning between different levels of student ability.
Items with discrimination indexes significantly higher than 0.30 would reflect that higher-scoring students are more likely to answer the item correctly, while lower-scoring students are more likely to answer incorrectly, thus showing the question's effectiveness in distinguishing between varying performance levels. However, a wide range of acceptable values is suggested by some sources, claiming that data do not reject values from 0.5 to 2.
The strengths and weaknesses of different testing formats, such as true/false items, are crucial to consider when interpreting discrimination indexes. While true/false questions are efficient and straightforward, the potential for guessing can muddy the interpretive waters, as noted in various educational resources. This factor underscores the importance of using the item discrimination index as one of multiple statistics to evaluate a test item's effectiveness. So, the statement is true.
