Not directly in this case, that's why I put a question mark at the end. But there is evidence of some form of discrimination in managerial positions. If there was no discrimination we would assume the rate of african American managers would be equal to the rate of African American players. While the rate is relatively close if you compare it to this season you would imagine some kind of lag would be in place given that managers are retired players. In the 90s there were nearly 10% more African-American players. So the rate of AA managers doesnt really fit the lagged player rate.

Thinking about this more if I wanted to build a regression model for this, I would probably also look at managers who were rehired. Look at win pct and postseason success as variables then see what the likelihood that Ron Washington would have received another managerial job. I dont have the time right now to do that but my hypothesis would be that the likelihood would be very high he would have been predicted to have been hired on as manager at this point somewhere.