The answer is no. Webspam does not use Google Analytics. And a while ago I went and checked and search quality in general, does not use Google Analytics in ranking. So you can use Google Analytics, you cannot use Google Analytics.
Whether you’re tracking your e-commerce, or if you’re just looking at the sort of searches that people use to show up on your site. Uh that data is not currently used in any way, shape or form, to the best of my knowledge, as of today May 17, 2010, in Google search results. So I hope that puts your mind at ease.
by Matt Cutts - Google's Head of Search Quality Team