http://www.webword.com/wp/2004/06/28/restoring-confidence-in-usability-results/ The usability blog of John S. Rhodes Fri, 22 Aug 2008 02:35:19 +0000 http://wordpress.org/?v=2.0.3 http://www.webword.com/wp/2004/06/28/restoring-confidence-in-usability-results/#comment-5580 Tue, 30 Nov 1999 00:00:00 +0000 http://www.webword.com/wp/2004/06/28/restoring-confidence-in-usability-results/#comment-5580 <i>"Here's what you should take away from this article. First, binomial confidence intervals are a resource saving tool during formative evaluations. When refining a new feature that needs a high completion rate, say 90% for first time users, you’ll know when to reject a design earlier. If only two out of five users complete the task, there’s less than a 5% chance that the completion rate will ever be above 85%."</i><br /> “Here’s what you should take away from this article. First, binomial confidence intervals are a resource saving tool during formative evaluations. When refining a new feature that needs a high completion rate, say 90% for first time users, you’ll know when to reject a design earlier. If only two out of five users complete the task, there’s less than a 5% chance that the completion rate will ever be above 85%.”

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