All other things being equal, a shorter test is more reliable than one with more items.

Question

Quizplus · Accepted Answer

The length of a test does not necessarily determine its reliability. Reliability is based on the consistency of the test results and how well it measures the intended construct. A shorter test may miss important aspects of the construct being measured and reduce the reliability of the test. Conversely, a longer test with well-designed items may increase reliability by sampling a wider range of abilities or traits.

All Other Things Being Equal, a Shorter Test Is More