Revised Beta II, Medium Level Ceiling?

Suppose that a subtest of an IQ test has a maximum score of 20. If you score 20 on this subtest, you have reached the 'ceiling'. Low ceiling means that most items on the subtest are easy and there are only a few more difficult items. It is low because it is relatively easy to get the maximum score, even if your IQ is not in the gifted range. High ceiling, in contrast, is when apart from the easy questions there are also many progressively more difficult items. So if you took a test with a low ceiling and got 20/20 your IQ could have been classified as being in a gifted range (e.g. 130+), but if you took a test with a high ceiling you might not be able to answer the most difficult questions (e.g. those that only top 1% of population should be able to answer correctly) and hence you would get a score of 20/30, bringing your IQ to an "average" level (e.g. 105). A medium level ceiling is something in-between these two extremes, there are more difficult items than in a low ceiling test but less so than in a high ceiling test.

Each IQ test, regardless of its ceiling level, will provide a score that can be translated into a specific IQ or a percentile (so each test in principle measures the whole range of IQs). However, those with higher ceilings are much more reliable and are hence preferred in clinical settings. But because high ceiling tests usually require individual assessment and take many hours to complete, the ones used in mass testing tend to have moderate ceilings.

Duh, what's a IQ test? Something about Indian Quilts?