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human
Rewrite the following academic sentence by making it shorter and simpler: The experimental group demonstrated statistically significant improvement in cognitive skills as compared to the control group who showed no significant change as measured by the standardized assessment tool utilized in this study.

Relevant data:
The group that had the experiment did better on a test than the group that didn't have the experiment. The test was given to both groups before and after.
gpt
The experiment group improved on a test more than the control group who took the same test, before and after.