The study shows that where the percentage of black and Hispanic children in a Texas school district is higher, the average score on the TECAT is typically lower for each race of teachers...black, Hispanic and white. The fact that teachers in Texas who instruct children of color tend to have weaker language skills appears, other things equal, to account for more than one quarter of the reading and math score differential between black and white children in Texas, and about 20 percent of the gap between Hispanics and white.