My niece has a Galaxy Tab 4 with 8 GB but can't install Minecraft because there's not enough space. After OS files and such after factory reset, there's only 3.5 GB available. I also can't configure it to install to SD card unless I root it.
Device model is samsung-SM-T230NU. It's running 4.4.2 KitKat, with Build Number KOT49H.T230NUOVU0AOG1
If you need any other information, ask and I'll edit this accordingly.