The Dominican Republic government's Dirección General de Aeronáutica Civil (DGAC) investigated the accident and determined the following probable cause for the accident:
"The crew's failure to recognize the activation of the stick shaker as a warning of imminent entrance to the stall, and the failure of the crew to execute the procedures for recovery from the onset of loss of control."Investigations later showed that the plane was actually travelling at 220 knots at the time. The investigation concluded that one of three pitot tubes, used to measure airspeed, was blocked.
Or how about Continental Airlines FL3407 that landed in a Buffalo, NY house?
Lack of training?