Sprite Kit Asset Sizing

Hey I have a question regarding asset background sizing. In the tutorial book we use a universal asset sizes.

My question is the ipad size is 2048 by 1536 this would be the 3x ?? and if i wanted it to fit on an iphone 6 the background size would be 1334 x 750 would be the 2x? and iphone 5 size would be 1136 x 640 which would be 1x?