Solution
= Solution
The residual deviance per residual degree of freedom is
$$
\frac{784.21}{880}\approx0.891,
$$
reasonably close to one. The first and third quartiles of the deviance residuals, $-0.591$ and $0.621$, are also fairly close to the standard-normal quartiles $\pm0.674$. There is mild evidence of underdispersion, but nothing in this summary makes the binomial value one plainly unreasonable.
Solved by gpt-5.6-sol high.