Answer
$X^2\lt X_α^2$: the null hypothesis is not rejected.
There is no sufficient evidence of racial profiling in Mundelein.
Work Step by Step
$H_0:$ race is independent of fault in a crash
$H_1:$ race is not independent of fault in a crash
Expected count of White: $9868\times0.719=7095.092$
Expected count of African American: $9868\times0.028=276.203$
Expected count of Hispanic: $9868\times0.207=2042.676$
Expected count of Asian: $9868\times0.046=453.928$
$X^2=Σ\frac{(O_i-E_i)^2}{E_1}=\frac{(7079-7095.092)^2}{7095.092}+\frac{(273-276.203)^2}{276.203}+\frac{(2025-2042.676)^2}{2042.676}+\frac{(491-453.928)^2}{453.928}=3.254$
$k=4$. So, $d.f.=4-1=3$
$X_α^2=X_{0.05}^2=7.815$
(According to Table VII, for d.f. = 3 and area to the right of critical value = 0.05)
Since $X^2\lt X_α^2$, we do not reject the null hypothesis.
