44kHz 16 bit Stereo	44kHz 16 bit Mono	44kHz 8 bit Mono	22kHz 16 bit Stereo	22kHz 8 bit Stereo	22kHz 16 bit Mono	11kHz 8 bit Mono
sample1	sample2	sample3	sample4	sample5	sample6	sample7
SIZE:904KB	452KB	226KB	452KB	226KB	226KB	56.5KB

I liked sample 1 the most because it sounded better than the rest of the samples. Sample 7 sounds terrible compared to the other samples, has the smallest size, the rate(11khz) is the smallest which also determined its poor audio quality. The sample size is only 8 bits which was not good enough to determine the accuracy of original sound...

Between samples 3,5 and 6, I'd choose sample 5. Its number of samples per second(22khz) was smaller than sample 3 and the fact that sample 5 has an uncompressed stereo sound, made it sound closer to the original file than sample 3 and 6.

Between sample 2 and 4, I'd choose sample 2 because of its better sound. The difference is that sample 2 has a higher number of samples per second(44khz) which made it have a better audio quality.