Those are the exact numbers to enter on your XBOX after you've used the Internet Connection Sharing wizard on your laptop. You also need to be sure to properly setup the internet sharing. Be sure that the source is the air card and that you are sharing with the ethernet adapter.

When you're done, hit [Windows]+R to bring up the run box, enter "cmd" to bring up the command window, and type "ipconfig /all" to confirm that your IP address on the ethernet adapter is set to 192.168.0.1 (the numbers on the XBOX will be slightly different if it isn't).