Is this a biased sample? Probably.
Why do you believe this? If you believe this, can you point out some steps that could correct the problem?
Well, not everyone elected to provide a testimonial, and there may have been self-selection in favor of optimism. Insisting that everyone write a testimonial might have helped a bit with that.
Why do you believe this? If you believe this, can you point out some steps that could correct the problem?
Well, not everyone elected to provide a testimonial, and there may have been self-selection in favor of optimism. Insisting that everyone write a testimonial might have helped a bit with that.