To improve your AdWords experience, we're testing a new tool that helps you optimize your account. AdWords Campaign Experiments, or ACE, does this by letting you accurately test and measure changes to your keywords and bids, ad groups and placements.
This video discusses understanding your experiment results and statistical significance.
For more information, please visit the Help Center at http://adwords.google.com/support/aw/bin/topic.py?hl=en&topic=28565
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