Sometimes we'll ask someone if they have Google Analytics installed but they don't know if they do or not.

This isn't as strange as it seems, it may have been installed by the web developer when the site was built, but because no one has never checked the stats, it's been forgotten about.  

To tell if you have analytics installed you need to view the html 'source' of your page.  In most browsers you can do this by clicking the right mouse button while you have your website displayed and selecting 'View Source', 'View Page Source' or 'Source' from the menu.

You'll get a screen full of code which probably looks a bit scary at first, but you only need to scroll down until you see something that starts with a line that looks like this:

"script type="text/javascript">var _gaq = _gaq | | [ ];_gaq.push(['_setAccount', 'UA-xxxxxx-x']) ;_gaq.push(['_trackPageview'])......."

 This is the Google Analytics tracking code.

Of course having this installed, and remembering what account it has been set up on is two different things. 

If you've lost the account name (ie the email address) it was set up on, you may have to get it re-installed.