A range is a value and when you choose a filtered selection of sales, you have put a range on it.
Appraisal practice includes consulting, reviewing, researching and market studies. Therefore, USPAP requires some things- ethical conduct, etc. The fact Std 1 and 2 do not apply isn't the issue. The fact such services could go undetected by the state board is not the issue. It is whether you are acting as an appraiser or not. And you are. And when you provide a value, a direction of value against a benchmark, or a range of value, you are now doing an "appraisal".
If you are a Realtor, then fine, wear your Realtor hat and do a CMA, but don't write the work "appraisal" on the work, nor sign as an appraiser, nor even mention your appraisal license....even so, if they hired you because you are an Appraiser- well, then you are an appraiser.