As noted above, you need a crack suppression barrier. The big box stores sell this stuff, but if you are lucky you may be able to buy this when you buy your tile. I used the Mappi brand as I recall. You put down a primer (the brush or roller is toast afterwards), and then put down the crack barrier. Then you apply the thin set and your tile. If you do not use the crack suppressant barrier your tile will crack when the concrete cracks and most concrete slabs eventually crack. Learned this from my step son that has done tiling for over 20 years.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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