Tests with many items that are very difficult are more reliable than tests containing many items of moderate difficulty.

Question

Quizplus · Accepted Answer

Tests with items of moderate difficulty tend to be more reliable because they are better at discriminating between different levels of ability among test-takers. Very difficult items can result in most test-takers scoring poorly, reducing the test's ability to differentiate effectively between higher and lower abilities.

Tests with Many Items That Are Very Difficult Are More