Just bought a Canon T4i DSLR. Recorded some test footage at 1280x720/60p in native .MOV

Objective: Play on the timeline in Slo-mo.

I rendered the file to SpeedHQ 1280x720/30p thinking that "halving" the 60p to 30p would play back at half speed. It doesn't.

I know that I'm not understanding the whole frame rate/shutter speed thing. What am I doing wrong?

Thank you.