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QUESTION

A ceiling effect is said to occur when: everyone participating is the experiment performs better than they ever have before b.

A ceiling effect is said to occur when: a. everyone participating is the experiment performs better than they ever have before b. performance is very high for one group, but just average for a second group c. there is one main effect, but not two d. performance is so close to perfect for both groups that any true difference between them is obscured

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