[SAump]

The stats are in.
85 white umps called strikes 329826 times.
3 latin umps called strikes 10681 times.
5 black umps called strikes 20302 times.

85 white umps were assumed to be perfect.
3 latin umps called strikes 959 less times than an equal number of their perfect white counterparts.
5 black umps called strikes 900 more times than an equal number of their perfect white counterparts.

The latin umps wanted to please everyone to prove they were up to the task.
The black umps wanted to show everyone proof they were up to the task.
The psychological theory behind these explanations are beyond the scope of post.

Latin and black umps, taken together, were "sepera-typed" from white umps by a total of 59 called strikes.
As a minority group, latin and hispanic umps perform up to the par with white umps.
59 pitches out of 30,983 pitches is roughly a 0.190% difference.

The stats and methodology used in this study were perfect.
There is NO racial evidence of discrimination by MLB umpires.
Everyone is happy!