1. How many white males were compared to how many black males?
Not clear. What threshold are you looking for?
2. Were all white males rated above all black males?
According to the report - yes.
3. Was other race groups (Asians) also present and how they were rated?
Yes. Rated lower than white males
4. Were different ethnic groups among the White population compared and if any group outscored other groups? How large was this difference compared to white-black comparison?
In the retail part of the study - irrelevant because it was scripted so ethnic alignment - which is not physiognomically determinable - could not be detected.
In the latter part of the study - the Hospital rating system - yes various ethnic groups were covered. No correlation.
5. Outside of the first set of experiments - was there done any comparison of service provided by a random group of white and black store clerks in the same store?
a) not relevant and not viable since you then lack an objective measure of performance
b) this is what the latter part of the study focusses on by looking at the data in a setting where objective performance CAN be evaluated.
Try again. Just go read the study.