From the summary output, `chasY` does not appear to be statistically significant.
```
## Coefficients:
##             Estimate Std. Error t value Pr(>|t|)    
## (Intercept)    3.744      0.396    9.45   <2e-16 ***
## chasY         -1.893      1.506   -1.26     0.21   
```