To view the statistics of a split test:

Go to the Reports -> Split Test Statistics (Fig 1). 

Fig 1

On the next page, you will see the list of your split tests. Under the Action column, click on the blue "View" link (Fig 2). 

Fig 2

You will now see an overview of the statistics of your split test. You can drill down by clicking the blue links within the tabbed pages (Fig 3). 

Fig 3