Minecraft can be played on your browser (online) or straight from your computer (download). Please note, too update your downloaded version you must have an internet connection.
In order to buy it, you need online. But you can select between online and offline after it is downloaded.
No you can not play xbox on line with PC.
No, the Xbox version of Minecraft is for Xbox360
You can't as you need gold to interact with other people online
No.
you dont have to be online, but you wont be able to play with others (if you have gold)
no.
An Xbox 360, and enough points to buy it on the store.
No, you do not need xbox live you only need the points to play minecraft (1600-$20)
If you are referring to Minecraft for the Xbox, then yes, you need to have a HD TV to allow splitscreen.
No, currently the only "online multiplayer" for Xbox is to join one of your XBox Live friends Online Game. Servers, linke in the PC version, are currently not yet implemented.
You do to play online on the Xbox 360 only. Other systems also have online games