ON DSCNT ACR ENCOUNTERS CAT. PAX INJURED; DSCNT BELOW ASSIGNED ALT.

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TOLD BY ZTL TO CROSS SHINE INTXN AT 11000 FT MSL. WHILE DSNDING THROUGH FL190 WE ENCOUNTERED SEVERE AIR TURB AND RPTED IT TO ATC. TURB CEASED AT APPROX 17500 FT MSL. SHORTLY THEREAFTER A FLT ATTENDANT CAME INTO THE COCKPIT AND ANNOUNCED A PAX WAS IN THE LAVATORY AT THE TIME OF THE TURB ENCOUNTER AND MAY BE INJURED. WHILE THE CAPT AND FLT ATTENDANT DISCUSSED THE SITUATION; THE ALT ALERTER WENT OFF; SIGNALING 12000 FT (1000 FT BEFORE ALT) WHILE MY ALTIMETER READ 12700 FT. THE CAPT HAD FORGOT TO RESET HIS ALTIMETER MAINLY BECAUSE THE PRELIMINARY LNDG CHKLIST WAS OMITTED DUE TO THE TURB ENCOUNTER (NORMALLY ACCOMPLISHED AT FL180). WHILE THE CAPT RESET HIS ALTIMETER AND ACCOMPLISHED THE PRELIMINARY LNDG CHKLIST; I WAS SWITCHING NAVAIDS TO FLY THE INBOUND COURSE ON THE ARR WHEN I NOTICED THE ALT WAS 10900 FT AND STILL DSNDING. I ARRESTED THE DSCNT AT 10700 FT AND LEVELED OFF AT 11000 FT MSL. ALTHOUGH THERE WAS A GREAT DEAL OF COMMOTION IN THE COCKPIT I BELIEVE A CONTRIBUTING FACTOR WAS MY RECENT LACK OF FLYING EXPERIENCE. I WAS FURLOUGHED FOR 1 YR AND BEFORE THAT SPENT 2 YRS AS A FE. I BELIEVE I SHOULD HAVE HAD THE CAPT SWITCH MY NAVAID FOR ME AND CONCENTRATED ON FLYING INSTEAD OF DOING EVERYTHING FOR MYSELF BECAUSE MY PROFICIENCY IS NOT AS GOOD AS I WOULD LIKE.