MIDUS respondents were asked if they agreed with this: "I am not afraid to voice my opinions, even when they are in opposition to the opinions of most people." Here are the means by race/ethnicity:
Mean "speaking up" score
* significantly lower than blacks at 95% confidence level
The gap between blacks and Asians is eight-tenths of a standard deviation--a large difference. Blacks on top and Asians on the bottom is consistent with my experience in the classroom.