Record a few sentences using Audacity. Make a monaural recording with a sample rate of 44100 Hz and 32-bit, floating point samples and export it as a 128 kbps .mp3 file.
That should be a CD-quality recording.
Compress the file by saving it at 112 kbps. Unless you have excellent ears and an excellent playback system, you will not be able to hear the difference between the compressed version and the original.
Compress the original further, trying different data rates until you can hear the difference.
Print a screen shot of the .mp3 option set at that data rate.
Turn that in along with answers to these two questions:
What was the file size of the original recording?
What is the file size of the compressed version in which you can begin to hear a difference?
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