Honestly, audacity has given me nothing but trouble when trying to export to WAV. Almost never seems to want to export in the bit depth & sample rate I select.
I'd suggest using GoldWave (technically free for non-commercial) , when saving files you can really easily select it from a drop down menu. Make sure that you use the "Resample" effect in the effects tab to reduce the sample rate from 44.1kHz to 11.025kHz.